Att rep took my returned att phones and never turned them in

I had a in home rep come to my house while getting direct TV installed.  He talked me into switching to att mobile, but promised I had 3 business days to decide if it's what I wanted. Anyways after 2 days and catching him in several lies I decided to cancel. I tried to return the phones and cancel at a store but they insisted I had to turn in the devices to the rep.  He came the next day and returned my phones I traded in and picked up the att devices.  Now att says they have not received the phones and there is nothing i can do except either pay the $1,300. Or call the police and file charges against the rep.  Not my idea but literally td this by customer service.  This is the most ridiculous, lying crooked,  company I have ever dealt with.