There is a do not call registry in the US that you can enroll in to keep advertisers from calling your phone. Might wanna try it. I've been on it for years and I never got those calls anymore. And I do mean never. LOL.

As for dealing with them, my grandmother used to blow a police whistle into the phone...lol. You can however immediately request that they never call you again. They have to comply.

Good luck.

Laurie