Like all things that upset companies, hit them in the wallet where it hurts and send them all back
Take the greatest pleasure with a marker pen and write maybe "RTS Gone to heaven address unknown?" then put them all back in the mail box with a big grin on your face, knowing you'll cost them money the other end.
I did this once with Readers Digest who would not stop sending me stuff no matter how many times I asked them but that did the trick.
I think you'll find they will begin to stop from the same people sending them, plus they won't pay the company who passed your info on to them to send their junk mail to you in the first place.