Anti-Counterfeit Internet Celebrity Insists That I Sell a Car That Was Involved in a Major Accident

I am a second-hand car dealer, and a brother who cracked down on counterfeiters came to my shop and bluntly said that I was selling cars that had been involved in major accidents. I denied it, and they slapped the table and asked me to refund one for three, and they wanted to ruin my reputation. The whole Internet was in an uproar, but I took my time and took out the professional test report. As a result, they couldn't sit still and apologized to me immediately. I sneered: "If an apology is useful, why do you need the police?"