Data Depleted inaccurately

When I stayed in JHB, I had no problem with Cell C data Package 100G day / 100G Night, never ran out of Data, I would stream you tube nearly 24/7 and watch online movies, game online and download, you name it and never had issue with looking up my data usage, nothing. Then on my request to Cell C before I moved I asked if I will have the same setup in Amanzimtoti Durban, their response was, yeah sure we have coverage there, BUT this is not true, now I have a couple of issues, 1. I have called Cell C to change my banking detail for new account, which they did not do and tried to redebit my old account and found insufficient funds, how ironic, I then had to proceed to paying the account manual, to which Cell C Agent gave me the incorrect Cell C Number as a reference, and now I have R 1001 just laying around as no one can allocate it to my account, but they double debit me the following month on numerous calls to try and sort this out. 2. My Data is depleted in half a month, which is insanely impossible, but when I request a data usage report, I get nothing, nothing is done to assist me, I can’t seem to understand how can this even be possible to use so much data in 15 days when I was in JHB, I never had that problem whatsoever, I just get thrown from one agent to the next, half of them trying to be helpful and the other half just plain rude and bad service 3. Cell C do not seem to have anyone of authority that can assist me, I am quite sad to say that they brag about sponsoring the Sharks but done even look after their clients, very pathetic, absolute poor and unprofessional network service