Every time they send you something, you can wrap the envelope around a brick or a rock, or something else heavy, and write “Return To Sender” on it, and send it back.
They get to pay the return postage...
Include in the envelope some outdated sliced sandwich meat !
Thanks to all who gave the advice of "SEND IT BACK, with comments" in their self addressed envelope, I will do that.
Bet ya, internally you are still on their rolls,just not their mailing list. boy am I skeptical, I trust no one.
I do that every time, and write on the paperwork I send back to them, to not send me any more of their crap.