Marketing Campaigns

Good Day.I have been receiving annoying ads played to me before my call is connected. I called the call centre today and was put on hold indefinitely so eventually I hung up. I want this removed immediately from my account. Firstly, on my MTN profile I have set the option to NO for marketing/newsletters etc, so who gave MTN the right to just go ahead with this in the first place. Secondly, I must now be inconvenienced by your call centre to get this ******* removed that I never requested in the first place. Sort it out MTN otherwise I may be tempted to take Cell C's contract buy out option.