How can I stop Telkom Mobile Consumer calling me?

Dear Telkom,<br> <br> I keep getting calls from *** on my MTN contracted cell phone. I do not answer and a voice message is left. The message indicates that Telkom Mobile Consumer left the message. I do not have a Telkom mobile contract and would not like to get one.<br> <br> How can I stop these calls without answering? I have been called twice a day for the whole week. Do you have a toll free number I can call to remove myself from your call center?<br> <br> PS; It IS nice that you leave a message, so I know who was trying to sell me something *thunbs up*<br> <br> Thanks<br> MTN Cellphone Contract Holding Dude