Telkom billed me 600% my monthly capped fee!!!!!

I've been trying, unsuccessfully to find out why i've been billed 600% my monthly bill last month! My account is capped, and my account should always be the same amount, until last month. I've been to the Telkom store in Tygervalley 3 times this past week, and everytime they tell me that the call centre will contact me to resolve the issue, this after standing in the queue for hours! When i call the Tygervalley shop, no one answers the phone! When i call the call centre, i hang up after 10 minutes of holding on with no indication of how long i still have to wait or how many callers is ahead of me! I just got a call from the telkom call centre @ 15:22, which i answered, but there was no response. A minute later i received a sms notifying me that Telkom tried to contact me as per my request. This is soooo pathetic! Do they just call to show on their system that they are responding to calls, so that they can close their logs!!!!!???? This is terrible! No customer satisfaction at all! How do i close my account AND get my money bac****!! I'm a VERY ANGRY & UNHAPPY client right now! Telkom totally suck at client service & i wont advise anyone to take out a account with this response rate!