Shocking service from Telkom

My December invoice had an amount of R2500 added to it for "out of bundle" usage. This made no sense to me as I never use all my data in a month. I queried this with them and they said there is nothing they can do about it. I asked them why is there no warning once one goes out of bundle and they couldn't really answer. They said that I can reduce the spend limit to 0 and I agreed to that. When I received my January invoice, once again they added a R2500 "out of bundle" usage. Again I queried this and once again they kind of said it is tough luck and I must pay. I had received SMS's confirming the spend limit reduction in January, however they told me it was never reduced. I forwarded screen shots of the SMS's etc. to Aqeelah Hendriks in Cape Town who promised to query it with the billing department. My February invoice has an amount of R2488 for "out of bundle" usage added to it. I have left numerous messages for Aqeelah to phone me, I have e-mailed her as well, but get no response whatsoever. On 4 March she e-mailed me saying that she would phone me at 15h00, but she never did. I have requested on numerous occasions for her manager to call me, but once again nobody has called me. Something has gone wrong on my account and nobody wants to listen. I cannot pay a bill of this size. I chose this package in order to have control of my account, but now I am getting accounts of R4000 per month. The service received from Telkom and Aqeelah is disgusting and Telkom should feel ashamed of themselves. I need urgent assistance with my account.