Over charge and think we stupid

Claim a new Cell from Cell C its more then a month and im still waiting. Cell C double charge me in August for Data i did buy 2 GB and they bill me for two time 2GB. Then i didn't Received a sim card and i didn't use the network for a month how can Cell C charge me more then my subscription of R300. Cell C debit my account with R975 for what?????????? i don't have a sim card or a phone!!!!!!!!!!!! I contact them but they not willing to help me they only told me i must pay but for what must i pay. How can we win with a company that rub you off.