How can I get AT&T to stop sending me junk mail.

I think I get a piece of mail at least once a month in my mailbox at home saying sign up for AT&T fiber.  I can guarantee that pigs will be flying long before I ever get AT&T fiber or anything else AT&T for that matter.  I have called them and asked them a dozen times on their toll free numbers to stop mailing me this and provided my address.  The old expression goes a penny saved is a penny earned and AT&T could save a tone with all the paper they have used to mail crap to me that will never amount to a sale.  They even started to leave off a return address so you don't know its them trying to sneak their junk in.  I've gotten to where I just recognize that its from them and toss it w/o opening it. Such a waste for them, and all they do is (Edited per community guidelines) me off.  Stop mailing crap AT&T!! Then watch your revenue go up since you saved paper, envelopes, stamps.