The collector sent a message to my friend. Is it true or not?

False, please don't believe it easily. These things are random, routine and deceptive. Because the registered accounts of many apps are real-name registration systems, it is easy to disclose personal information and be used by some lawless elements 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.