Unexplained high bill data contract+Poor service

I am on a 2G R99/pm data contract and have had this contract for just over three years. On the 1st of September I received and sms saying that my data usage was unusually high at R4854. I immediately called Vodacom <br> 1) Check if this sms was intended for me as it seemed ridiculous that I would have a bill that high,<br> 2) To request an itemised bill for said month<br> I waited for two weeks before calling back Vodacom only to discover that no one attended to my request even though I sent the formal letter and ID requested by Vodacom. I again lodged a new request for the itemised bill which I received only on 14 Sept. Upon receiving the itemised bill I could not understand it as it reflected numbers and codes that meant nothing to me. With frustration I called back, by this time it was the 18th of September to request someone to explain what the codes meant and how the sum up to R4854. My request was sent to \back office"and today is the 1st of October and still my request is said to be \""pending\""of the system and that I must understand that it takes time to investigate a request of this nature according to Vodacom's call centre agent. I reversed the last debit order until this is sorted"""