My mother was being bombarded with calls from this number so called it and got a recording claiming it was the AT&T U-verse Promotional Dept.  It then went on to say they were closed even though I called during their stated business hours.  I called AT&T Customer Service and they put my mom on their internal do-not-call list.  The guy I talked to was very pleasant and said they were going to look into the number because he could find no evidence that it was one of their promotional numbers.  Will update.