I have spoken to a lot of people, including Vodacom and a private investigator. The P.I. told me the only thing you can do is go to the SAPS, and it will take like 4 months! And you have to LIE on their backs to get anything done. Plus you have to tell them it's really BAD...life threatening calls, driving past your house, etc etc etc, otherwise they will not even consider it. He explained the process the cops take, and it's a LONG one...so not really worth it, unless the calls really do start becoming bad.
He didn't seem to keen to want to help in his private capacity either.
To change my cell number would cost about R285, and it's effective immediately. They can do it over the phone. Only problem is you have to let everyone know about your new number, change business cards, etc etc. A real shlep and not really an option for me.
The next time this person phones I will just casually say "i have been to the police, they have requested a "205 subpoena" to get my incoming calls records, and to trace your number and your cell phone's location. So hang in there, the cops will soon be knocking on your door..."
Also, at night I will just switch my phone off. And maybe just not answer any calls from "unknown" or "private" numbers. I mean if they can't hear you answer, or just get the standard "the number you have dialed is not available at present.....etc etc" every time they call surely they will get bored of it!!!
It sucks that we can do so little about this. If people CHOOSE to call you, with a private number or not, they actually already gave up their right to be anonamous. It's b*llSh*t!!!!