IM SO GATVOL OF MTN!!!!!!

Well it started when i cancelled my contract on the 16th of September since it was due for cancellation. I was given *** & told my contract was cancelled. On the 22nd i received airtime with 25 smses, i then queried it with them that it was a mistake & they should credit it back. Till to this day im still on the battle of them to reverse the charge but they refuse to do it. They are telling me that i only cancelled my contract on the 22nd. When clearly it was done on the date given by them. I never even used their stupid airtime & smses but because they are slow & not doing their jobs, i now have to pay for it. It was not my fault that they didnt cancel the contract when i did but a reference was generated. I also tried to lodge a complaint on their site but it doesnt work. I will not pay for their mishap, they can hand me over if they want. i refuse to pay for a service i didnt use or want. They also refuse to give a termination fee for all the other contracts that remain with them as im gatvol of the network with their airtime & data disappearing!!! This is really ridiculous! I cannot believe they are actually expecting me to pay for 25months contract that i cancelled!!