I have asked them to stop calling multiple times, they continue to call, and at 9:00pm. This has woken my daughter up a few times. I'm fed up with them!
They called me looking for an old tenant. I think it's a collection agency. Collections use their last known address and then run a reverse search and come up with a landline to call. In my case it's my home number and I get called on old tenants all the time from collection agencies.