Well look at it this way.........Every piece of mail you get from AT&T serves two purposes. 1) It keeps the US Postal Service somewhat in business so we can comtinue to get our regular mail delivered, and 2) It keeps your city (if they have recycling) funded also so taxes don't go up.
When you receive the unwanted mail simply throw it in your recycle bin and put it out for pick up. Not a solution to your problem but what the heck......
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*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.