MTN Bills incorrect amount, then cuts off service

I received an account from MTN dated 11th Sept 2015 fr R498.95. I have had a contract with MTN since April 2014 which costs me R269.00/month and I have never had to pay in more than this amount. When I checked on my phone the amount of airtime I had available, it stated that over R400.00 was still available. I then took the account to MTN at Steenberg, Tokai and questioned the account. The employee told me he would make the necessary amendment on the computer and I would hear from MTN the following week. In the meantime I had made the usual payment of R269.00 that was owing.<br> I had a text message from MTN the following week saying that if I did not pay the outstanding amount of R229.95 my service would be disconnected. I again went to MTN where I was told that I had to pay the amount outstanding. When I complained, they merely shrugged their shoulders & said that the amount of R229.95 would be deducted from my next month's statement. I was cut off, paid the amount of R229.95 - NOT owing by me - & was re-connected 2 days later. <br> This was atrocious service. No apology was forthcoming & no attempt to pacify me by offering me free month's service for mistake by MTN not me.