Paying for sms that cannot be used

I have endless problems with this contract and no one at Mtn can assist. In my previous complaint I still did not receive any call from a team leader as promised. Mtn staff are *********** and cannot stick to there word. I receive free sms's on my contract, for some reason I cannot receive or send any sms on this number ***, since 12 October. I went to the store in westgate mall and according to them it was fixed. I called the call Centre a few times, received reference numbers and no-one can help. Spoke to Lebo on Sunday and was advice feedback will be received in 2-24HRS no feedback received. I spoke to Ntokoso last night, was on this call 44 minutes, matter still not resolved. I really had it with this bad service and the fact that no one can assist, or comes back with feedback. I have this contract since 4 September and the only thing I received was bad service.