AT&T – Install deal was bogus

I received something in the mail that advertised that AT&T would offer 15 bucks for phone and 15 bucks for internet for one year. It also included free installation and a $100 visa card. Well I thought that is was a good deal so I went ahead with it. Everything went fine and I got my pre-paid card. I used it and then I looked at my bill the next month and it was $75 instead of the 30 I thought it was.