Unwanted SPAM without consent

When taking out my mtn contract I did not opt for receiving promotional messages. I was very clear about this. I did not tick the consent box and clarified with the consultant that I do not want SPAM.<br> <br> I have been receiving SPAM messages several times per week. The kind of message I am getting include, but are not limited to:<br> You better believe it! *** you were flagged as a special customer to enter the draw for 10 thousand Rand cash! SMS your name to 47940 at no cost to enter the draw today! Visit promo.mtn.up.st for T&Cs. It's free of charge! Brought to you by MTN (To opt-out send CANCEL to 47940)<br> <br> I have tried opting out and phoning mtn consumer services several times and the SPAM hasn't stopped. It is unwanted. I am also receiving unwanted SPAM from other companies - I suspect MTN has given my private contact details to third parties despite not receiving my consent.<br> <br> I have phoned MTN several times to try and sort this out - I just get referred back and forth between departments and the SPAM keeps arriving.<br> <br> MTN has betrayed my trust, disrespects my right to privacy and is somehow unable to solve the problem. They don't indend to keep our details private.