BAD SERVICE MTN!!!

In Febuary my MTN contract expired I phoned MTN in March to cancel my contract with immediate effect, it was confirmed from MTN that my contract was cancelled, but to my surprise they deducted the contract amount again end of March. After this happened I sent them an email demanding an explanation for the deduction without response, then I emailed customer care with all the supporting documents regarding the cancelation MTN just rep**** it is with accounts. Subsequently MTN has continued to deduct the contract amount in April and May 2015. I have phoned them numerous times only for MTN to cut connection and never reaching the relevant departments and my emails are not rep**** on. I have visited a local branch only to find the personal extremely rude and not helpful. the only advice they gave me was to allow MTN to deduct the contract amount till the strike is finished only then will MTN assist me. I mentioned that I am going to stop the payment at the bank only to be threatened that MTN will blacklist me. They offered no help at all. I have honored my contract obligations to MTN only to have this type of poor service and extremely rude and inefficient people, you should be ashamed