It not just emails where this happens. Some idiot has been giving out my work mobile number as his own. I got a call from his aunt to wish him happy birthday

It not just emails where this happens. Some idiot has been giving out my work mobile number as his own. I got a call from his aunt to wish him happy birthday (she was incredulous when I explained that no, this isn't X's phone, and I don't know x). I get random texts from I assume his friends, and calls from collection agencies.