Called stating that they received our bill returned to them, as our mailing address was incorrect.  Couldn't be.  ATT cannot get any information correct.  They have pulled old information from our company before, when we keep our records up to date with them.  After all, they are the one's servicing our business phone, so one would think they would have the correct information at all time.
If we had a choice, we certainly wouldn't have ATT for service.  However, no other company that services our area, is able to provide service for 5 business lines plus keep us with half way decent speed internet.