I sent a short message to my friend about debt collection.

False, please don't believe it easily. These things are random, routine and deceptive. As many registered accounts of APP are registered in real-name registration system, it is easy to disclose personal information, which is used by some criminals to spread threats and other information. Even if there is arrears, there must be legal channels to solve them. If you can't give you a message, you can easily believe it. So ignore it. I hope it helps you.