Incorrect Billing and Pathetic Service by the worst company ever!!

I signed up for a contract with auto page in June 2014. The contract cost R229 per month. I was then transferred over to Glocell recently but not on a voluntary basis. In February 2016 before I could be transferred I changed my contract to a top up due to me being overcharged. At the end of April 2016 after switching to a top up, I was billed an amount of R1619. I queried this with Glocell and they advised that they would look into it and get back to me. My first query was on the 15/04/16 and to date have not received a response only empty promises. I even spoke to the office of the ceo who advised that they will look into it and are awaiting a response from Cellc to advise how the data was used. I then received an itemised billing in the interim stating that I had used the data from the 01/03/16 @ 1819 continuously to the 03/03/16 at 17:11 and then again on the 06/03/16 @ 21:38 I used 1024 of data and then again on the exact same day and time I used 1,369,502,720 of data. Firstly, I did not use this data.Secondly after switching over to a top up contract on the 29/02/16, I was unable to connect to the Internet with the contract sim and was therefore unable to make use of the data. Thirdly, I am a working class person who doesn't have the time to sit on the Internet for so many days in a row. Also, when I am not using the Internet I do not leave my modem plugged in. I am being ******. This is not the first time that this had occurred. During the first month of my contract the same thing occurred and when I queried I received no feedback so I let it go. This time I refuse to leave it alone. After being advised by GloCell that they are awaiting a response from Cellc I got no other information. I then decided to put Cellc on hello Peter explaining my problem. I received a call from Cellc and they advised that my number doesn't even exist on their network. So who's network am I on if I have a cellc number? I was then advised that I needed to speak to Glocell as the contract is with them. I have tried to contact GloCell on numerous occasions but have received no response. Previously I was **** to as well because they were doing nothing about it.GloCell is the worst company that anyone can deal with. I WILL NEVER TAKE A CONTRACT WITH THEM AND ADVISE THAT NO ONE DOES. I want my money back. I have other commitments. I cannot afford to be ******. I want answers and my money back or else I will continue to pursue this matter by going further through the media and any means possible. This is completely ridiculous.