Telemarketing

These people phone you constantly from different cell phone numbers. I have previously requested them to remove me from their mailing list, but they just don't listen!!! I don't have an account with them and only ever purchased in cash. Now they think they have the right to harass me. When I told the lady now again to remove me from their contact list, she said oh but why? It is my choice to be contacted or not and I don't want them to contact me!!!