lack of service and extremely unhappy client

another week has passed, mtn's turn around time is 5 working days, till now i have not received any feeback via email or any other way, the sim car is completely dead and useless, we had to buy a new sim card in order to use the phone and had to spend another R 145 to buy a data bundle and r30 for air time, and all of this will not be refunded by mtn. i still have no idea why mtn is over charging me for a top up contract? or why they keep suspending my contract on the samsung tablet and the sony z3, from hear i should rather take this matter higher maybe then some one will take notice of a disgruntled customer and provide some sort of an update, <br> <br> my direct email is [Email Removed] i await a responce