It shows that this person has a lot of time and patience. If you don't want to quit the group, ask the group owner to reflect this matter. Settle if you can. If you can't reconcile, please quit the group. He changed his QQ number to scold you, so you drag it down and ignore him. I believe no one will pay attention to him, and he will soon get bored and won't register a new name to scold you. In addition, you can also tell Tencent customer service about this matter, and remember to tell others his official QQ number and the number when you reply. Tencent can check the login IP and records.