Stop answering in all ways to change that or try blocking the number. Leave all unknown numbers alone, they less you're going to get. A call blocker may be of some help.
Get calls several times a day, answered a couple times & told them don't know how they got my cell # and take me off their call list but they keep calling.
This number has been calling me for weeks ..i never answer it ..calls one right after the other with only seconds in between calls..its getting really annoying ..calls several times a day every day