Promised phone pay out

hi my name is Shawn Lossing few months back it was braught to my attention of a deal that was going on and i was talked into switching phone services to xfinity from verizon that i had been with for many years some of the perks that i wqs led to beleave and told by xfinity was that they would pay what was left on my phone bill to verizon so i could switch over to them and so i took Great thaught in it and it was way cheeper than what i was paying before for 2 lines so i took the deal and switched it came time to process my first  bill and i was reaformed that the promotion was false and the xfinity person i spoke to miss led me with information since then i am left with a hefty bill now to pay the phones off from verizon and so i called xfinity and they said they would take care of it since it is on there part and wrong doing of any of this situation happening so i was told to get whats left that i owe and give them the bill and they  would take care of it still to this day i have called plenty of times probably over 10 times and they just give me the run around saying the same thing and still yet nothing has happend to take care of my situation the phone bill is on me still yet to pay