Awful account service from mtn

<p>I have been having serious problems with mtn. After I posted a review last month about my account and mtn rep called me sort out my account. I was ensured that I owed mtn 1400 for the month of October and November. I said they need to debit my account with the amount that is outstanding. They did do they on the 31st of October but they have frozen my account again saying that I owe them 740 again. I don't understand where this amount comes from as on my statement it clearly shows that I don't owe mtn any money and that my account is up to date. </p>