The buyer contacted us to purchase U with cash, and we agreed to meet at the destination at 7 PM for the transaction. We used a 10U test address, and the buyer confirmed receipt. However, after we transferred the remaining balance, the buyer kept delaying, claiming they hadn't received it. Then, while we were distracted, they stole 230,000 RMB from us and accused us of robbery. Now, reporting to the police seems futile as this matter is not protected by law. I don't know what to do now.