MFC Nedbank keep phoning my land line to speak to a defaulter that I have never heard of.

I have been harrassed by MFC Nedbank for nearly four years on my private land line. A never-ending succession of agents phone asking for a Mr Oberholster who, I presume, has repayment issues. I have repeatedly and patiently told these agents that they have the wrong number. I have asked for my number to be removed from their system every single time. I have been consistently polite and firm but over the past few months have lost patience. I have started asking for the callers' details. So far Dudu, Cecelia and Thuli have promised faithfully to take my number off their system. Instead the calls have increased. Yesterday I had no less than 6! It is quite obvious that none of these agents have any intention of solving this problem. I have never been a client of Nedbank. If this is how they conduct their business I hope that I never have reason to fall into their *********** clutches. I don't know who Mr Oberholster is but he is obviously sitting pretty somewhere, having given his creditors a made-up contact number. Thank god it was just my land line. I hate to think what horrors would have awaited me if Nedbank's band of blood hounds had been let loose on my cell phone number or email.