If you find that you have been cheated, and the amount is still small, you can immediately take screenshots to save evidence, such as transfer records and chat records, submit them to customer service, and then wait for a reply; If you have each other's WeChat and QQ, you can report them first and then delete yourself.
If the amount of fraud is large, you can call the police directly, go to the police station to make the corresponding record, submit some evidence, and then wait for a reply. Now QQ is a real-name registration system, and if the amount reaches the filing standard, there is still a chance to get it back.