The most Pathetic Service. MTN is extremely usless

I had 2 contracts with MTN of which I cancelled in August. But MTN debits my account in Aug and September. I call the centre on the 13th October Ref *** requesting these contracts to be cancelled immediately as it is now 2 months that I was billed for something that was not in use. but Guess what. I get billed again in October. I call again on the 19 November extremely furious, but yet again my account is billed and my accounts are not closed with this useless service provider. I want both my contracts closed immediately and refunds on both accounts credited to me Immediately from August till November! do not contact me on the MTN numbers, as this is not in use! contact me on *** and have this resolved