If you are stuck in such a situation, here is what to do.

Mr. Alistair Finch decided to sell his family saloon car through an online auction platform. A dealership, “Apex Auto Traders,” based in Portchester, placed the winning bid at £15,000. When their representative arrived to inspect the vehicle, they pointed out some minor bodywork scratches and requested a deduction. A key detail is that the invoice prepared by the dealer had a clerical error, mistakenly listing the car’s price as £16,500 instead of the actual £15,000 winning bid. Unaware of this specific error at the time, both Mr. Finch and the dealer’s representative negotiated a £700 deduction from the incorrect £16,500 figure, arriving at a final, agreed-upon price of £15,800. This new price was documented on the invoice, which both parties reviewed and signed. The payment was made, and the dealer took the car.

A few days later, Apex Auto Traders contacted Mr. Finch, claiming they had discovered their error and had overpaid. They are now demanding a refund of £1,500, arguing the final price should have been £14,300 (the £15,000 winning bid minus the £700 deduction). They have threatened to initiate legal proceedings if the amount is not returned.

Advice in such cases

• Do not panic or immediately agree to refund any money. The situation is a contractual dispute, not a simple case of overpayment.
• Review all your documentation carefully: the auction confirmation email, the signed invoice, and any text or email correspondence regarding the price negotiation.
• Keep all future communication with the dealer in writing (email is ideal). This creates a clear record of all exchanges.
• Politely but firmly state your position in writing. You can state that a final price was negotiated and agreed upon in good faith on the day of the sale, as evidenced by the signed invoice, and you consider the matter concluded.
• Consult with Lawyer: The very basic and important step to start is talk to Lawyer / advocate. You should not hesitate in paying his consultation fee i.e. might be in range of 100 GBP to 400 GBP depends case to case. He is helping you in this situation of come out. He is expert in the domain and can help you explain the procedure which you might have never explored.

Applicable Sections of Law

This issue falls under the principles of English Contract Law. There is no single “section” but a collection of principles that apply:

• Offer and Acceptance: An argument can be made that during the in-person negotiation, the dealer’s offer of £15,800 constituted a new offer to vary the original contract. By accepting this and signing the invoice, you formed a new, binding agreement for that specific price.
• The Law of Mistake: The dealer would likely try to argue the contract is voidable due to a “unilateral mistake” (where one party is mistaken). However, for this to succeed, they generally have to prove that the other party (you) knew about their mistake and took unfair advantage of it. Since you were also unaware of their clerical error, this would be difficult for them to prove.
• Contractual Estoppel: The signed invoice is a powerful piece of evidence. It’s a written document confirming the agreement between the two parties. The dealer may be “estopped” (prevented) from going back on a fact that they themselves documented and both parties agreed to at the time of the sale.
• Unjust Enrichment: The dealer might claim you have been “unjustly enriched”. Your defence to this is that the enrichment was not unjust; it was the result of a formally agreed and documented contractual price, which you were entitled to receive.

If you are the complainant

If you were the dealer in this situation, your course of action would be:

• To gather evidence of the original winning bid and the clerical error on the invoice.
• To send a formal “Letter Before Action” to the seller, outlining the mistake and demanding the return of the alleged overpayment. This is a required step before starting court proceedings.
• If the seller refuses, you could initiate a claim via the County Court’s online money claim service (often referred to as the small claims track for amounts under £10,000).
• You would have to persuade the court that despite the signed invoice, the true intention of the contract was based on the original auction price, and the deviation was a clear, rectifiable error.

If you are the victim

As the seller (the “victim” of the legal threats), your position is defensive:

• Your core argument is that the signed invoice represents a final, binding agreement that superseded the initial auction price.
• You would argue that the dealer, as a professional in the motor trade, bears the responsibility for the accuracy of their own documents. Their clerical error should not be your liability.
• You should respond formally to any Letter Before Action, refuting their claim and stating that you consider the agreed price of £15,800 to be full and final settlement.
• If they do take you to court, you will need to file a defence based on these points and present the signed invoice as your key evidence.

How the police behave in such cases

The police will not get involved in this matter. This is a civil dispute concerning contract law. It is not a criminal offence such as fraud or theft, as there was an exchange of goods for payment that both parties consented to at the time. If contacted, the police would advise both parties that it is a civil matter to be resolved between themselves or through the civil courts.

FAQs people normally have

• Do I have to pay the money back just because they are threatening court?
  No. A threat of legal action is not a court order. You are not obliged to pay unless a court judges against you.
• Is the signed invoice legally binding?
  A signed invoice is extremely strong evidence of a contract. It documents the terms agreed upon by both parties at that moment and is difficult to dispute, especially when it was prepared by the party now challenging it.
• What are my chances if this goes to small claims court?
  You appear to have a strong position. The fact that a new price was negotiated and explicitly agreed upon, and that the error was made by the professional dealer, weighs heavily in your favour. A judge may well conclude that the signed invoice represents the final agreement.

What evidence is required?

Both parties should retain the following evidence:

• The original auction listing and confirmation of the winning bid price.
• The signed invoice detailing the final agreed-upon sale price (£15,800).
• Bank statements showing the proof of payment received.
• Any emails, text messages, or other written correspondence between you and the dealer before, during, and after the sale.

How long will the investigation take?

There is no formal “investigation.” The process is driven by the complainant. If the dealer decides to pursue a court claim, the small claims process typically takes between 6 to 12 months from the claim being issued to a final hearing, though this can vary depending on the court’s workload.

Advocate Sudhir Rao, Supreme Court of India