Telkom mobile sales is intrusive

Mobile service is good and consistent. Their telesales, on the other hand, is dreadful! I constantly get calls on my cell phone and if I don't answer (I'm in a meeting!) the call comes through on my land-line and interrupts my meeting. I get the same call a week apart trying to sell me some add on stuff that I have repeatedly said I don't want and when I start asking to be removed from the call list, the operator hangs up on me. Very unprofessional! STOP CALLING ME