top up ADSL CHARGED BUT NOT ALLOCATED

I purchased a 50 Gb top up in my credit card on the 20/09. It has never reflected on my account or purchased history however Telkom tells me I used it up in 3-4days. Their call centre can't help solve the problem and only know how to forward you from one department to another. Spent over 45 min without anyone helping me or even able to log my problem and get a reference number. Their technical department could not even tell me how much data I used between the 20/09 to 24/09. They did not know how to convert from bits to GB. Unbelievably frustrated that I've been charged yet Telkom can't provide me prove that the I receive the data I paid for. Anyone else doing this or providing such bad service would be up for ***** charges.