I bought a Cell Phone in 2013

Since I bought an LG Phone in 2013 on contract and realising that I must have finished paying I called around March to cansel my contract with them the offered another phone and I was decline and when I was declined they did not cansel it and when I check they are stil charging me even if I'm not using their seem Card because when I bought it I actually wanted the phone. When I call now they stil need the last payment even if I tell them I don't need their Airtime. so please help me I don't want to pay for that Airtime because I'm not using it I want to reverse my money from the Last time I finised payid. Please help me Hello Peter cause I know your service towards is good you once assisted me around 2011. I appreciate you. The Refference no is: vrmm***8