Disappointed

I cancelled my one mtn contract in June of 2015, right around the time that mtn decided to have a strike. It was an absolute nightmare to get my cancellation figures and when I finally managed to speak to someone at the call centre and get the figures I was told that if I paid them before my next debit order date I wouldn't be debited for the contract and I did as I was told only to be debited for the contract AGAIN at the end of the month. I then returned the debit order and sent an email to customer services, as phoning them was a nightmare with their skeleton staff during the strike, and said that I had already paid the contract in full and that they should check and debit me for the correct amount. I eventually received a response a couple weeks later which said that I still owed a little extra on the contract.... I'm sorry but if you have given me a settlement figure than that's the final figure. And then mtn sneakily put the account off debit order onto a cash in store contract without any notification to me whatsoever and no reply until date for the breakdown invoice requested. My credit record is in danger due to their negligence and bad service. Shocking