AT &T BIGI Phone Scam Ft. Wayne Indiana

My I Phone was stolen so I went to the ATT Store in Altamonte Springs, FL at the Jamestown Shopping Center and they had this promotion Buy 1 Samsung Galaxy Phone and get one free - But I also had to purchase another phone line, which I did  not need.   When I get my bill and review it, I am being charged for both phones - however after three months they prorate the second phone back on your bill at 23.17 a month not the 26.50 a month they are charging you.   I paid the phone I bought off this month, got my bill and they are still charging me for the free phone at $26.50 a month.   In order to leave ATT I have to pay 20 months phone line charges for the phone I did not need for a total $509.  This phone was not free by any means and when I leave ATT I will not be a customer of theirs ever again.   I have been with ATT for years.  This is a the worse scam ever.  These phones are the worse ever.