SERVICE LINE SUSPENDED DUE TO INCORRECT BILLING

On the 1/2/15 I upgraded my top up contract with the Waterfront branch, Cape Town. I was advised that i would be paying a fixed amount of R604pm which included insurance. I had a credit on my account of R720 which i had paid in advance. To my surprise i have been billed out of bundle charges for the 2nd phone for Feb and March even though i had a fixed, top up contract.I was told that the system incorrectly billed me. On 2 Occasions i visited the branch to advise them of the query. On 9/4/15 Siphokazi advised me that she will sort this out and even advised me she would forward this to her manager. I received on the same day a req ref of *** that it would be reversed asap. Instead i received a demanding sms on 22/4 that the amount of R956.45 need to be paid or my line would be suspended and this would affect my credit rating, Before that i had contacted the Call centre on numerous occasions having to wait more than 20mins to speak to a consultant. Eventually i gave up. My line is suspended and being in sales myself i cannot access my clients. No response from the Waterfront branch or even Mtn's Billing dept which delivers a horrible service. Utterly disgusted and unhappy client