Slow Resolution of Billing Query

2 wks ago I received an sms saying my bill was in excess of R3000.00 and my fone was disconnected. I then called the call centre and my service was restored. On 10/6/15 I received another sms saying my bill was now standing at R4161.84!! I then called again to confirm that this must clearly be an error, which the call centre agent agreed with but was told that the manager was in a meeting and would call me back, which never happened. I then decide to go into an AP store in Canal Walk and was met with much reluctance (he didn't even check my acc on the computer) and was told to contact the Accs Dept! Then with my fifth call to AP I'm still in the dark! I as told by the call centre staff that I used a large amount of data which I confirmed I didn't but they would hear nothing of it! According to their records I owe the money. I've been with Autopage for 17 and a half years, have always paid my bill on time and my bill was never this much in excess. Needless to say I WILL NOT be renewing my contract! I'm still waiting for someone to call me back!! I'm so dissatisfied with the service I have been receiving and incompetence of the staff.