TELEPHONE SALES......

What can be done with regards to Telkom phoning me every 2nd day to sell me a promotion.... I've requested them to please stop phoning me because I don't want another phone contract but they keep ignoring me. I know the Consumer Protection Act states I have a right to privacy which means the following and I quote "Consumers have a right to refuse unwanted direct marketing such as telephone calls, sms’s, spam e-mail or letters. Once opted out the supplier is not entitled to continue any unsolicited direct marketing." I've asked them numerous times to stop contacting me but they won't so I will have to take this matter further if I receive one more call!!!!!!!!!!!