Over debits and lack of response

I have waited 10 days since I emailed the Customer Care department (where i got a reference number from their automated reaponse). My query was related to billing. Since I upgraded, ridiculous amounts have been debitted from my account. I mean, i sign for a specific amount (a fixed topup contract that cannot incur extra costs), is it even legal to debit more than that. Service SLA's are ludacris. <br> <br> I am also still waiting for feedback on another query i had months ago regarding data, where I apparently had night data and was depleting my airtime out of bundle rates. When i check my balance it doesnt state night data, how am i supposed to know and budget accordingly. Ive wasted 100's of rands of airtime because of their inability to correctly classify their products and services. <br> <br> All email correspondence and reference numbers can be provided on request, however it should be on the MTN system as unresolved unless tickets get resolved without actually responding to their customers.