Being billed double the fee

I have been a loyal Cell C subscriber for the past couple of years.<br> I am signed on to a R399 per month bundle, every other month I exceed my data cap and so buy a data bundle.<br> For the past few months, I have been receiving bills for just under R900. This cannot be correct and I don't have the time to be passed around a call centre from person to person.<br> <br> I would like full and accurate statements emailed to me for the last 6 months. I would like finance to review the info with me, whilst holding a copy of my contract in hand.<br> <br> Should this be an unacceptable error on your side then I am sure you will happily refund or credit my account effective immediately.<br> <br> I am now due for an upgrade, now's your time to shine.. do I have this fixed with Cell C, or do you push me to another service provider?