RIDICULOUS BILLING!!!!

I refer to a data contract that ended on the 21/08. On the afternoon of the 21/08. I was contacted by Yvonne regarding an offer of an upgrade on this contract. She said I was paying R131 and offered me a 2GB top up contract for R110. I advised her that I cancelled the contract and according to her she had no record of this. With the persuasive nature of the consultant I accepted the offer. On the evening of 22/08, I contacted Autopage to see if this contract had been activated only to discover that this account had been suspended since 08/08. According to the lady I utilised 4GB of data over and above my limit and was thus charged at out of bundle rates, she informed me that the cost was R4800. My concern is that I was not notified that I had exceeded my limit nor was I notified that my account had been suspended. Obviously something was seriously wrong for me to have utilised that amount of data. In the interim I have been receiving calls from consultants offering me other benefits and packages but I had not received a call informing me about my suspended account. This is not my first complaint with Autopage and previous complaints are yet to be resolved. Absolutely disgusted!!