I haven't answered but they are calling me multiple times a day since yesterday. No message

I called the number back. It's a recording saying if I am not interested in future promotions to press 1 to be put on their "do not call list". I pressed 1. I don't know how these companies are getting my mobile number but I already registered on the national do not call list. These people are out of their god damn minds. Telemarketing should be illegal.