Overbilling on Account

I have logged a query with CellC on the 09/12/2015 regarding an over-billing on my account (Charged R49 instead of R12.50 for 1gb NiteData bundles)<br> <br> I have followed up on this query THREE times already, on the 11, 15 and 18 December respectively. Every time I was told that my query has been escalated and yet NOTHING has been resolved? I regret ever renewing my contract with CellC as the network is, ever since I can remember, terrible, always struggling to get signal just to merely send a text message.<br> <br> Please resolve my query immediately otherwise I will be forced to take this matter further.