Where is the information of the trainees in each training class now?

Everyone has a mouth to eat. Just because you don't need it doesn't mean others don't need it.

You should be a student at home, so it is reasonable for them to recommend their own training courses to you.

There is no need to take them to court. What's more, even if you take them to court, nine times out of ten you will lose.

Of course, calling the police is useless. Effective measures should be taken. You can find a reason to hang up as soon as possible when talking, for example, it is not convenient to talk now, and then you can directly refuse to listen when he calls back.