Overcharged after upgrade

I have sent through numerous requests to have my account looked at, via email and call backs. No answer to date. I recently upgraded to a package of R399 per month and also have a data contract. All inclusive costs, my account should be debited with R517.50, instead my account was debited with R667, and I do not see a breakdown for this figure anywhere on my account! If I look at my next invoice, due end Feb, it totals R816! This is utterly ridiculous. please communicate with your customers as to what you are charging them, This customer service experience sucks! Also, my husband's contract recently ended, and you guys are charging him for the device cost even though he has paid 24 months worth of payments already.<br> <br> PLEASE can you urgently address this issue.<br>