Don't even tell them to remove your phone #. Cause they'll request your number to delete it...but what they really do is
get you phone number and use it to charge their bills to your number. Just simply don't answer when you see their phone number. Reject it on your cell phone and delete it. On your landline, just pick up the receiver and hang up immediately.
This number called twice on the cell phone and twice on the house phone. It rings and hangs up, doesn't leave a message. This happened today at 2 pm and just now 4pm.