Call Centre Harassment

I have been receiving 10 calls a day from Telkom, looking for a Shireen Bouwers. I have tried explaining to every single one of these people that I am not Shireen and they have the wrong number and begged for them to fix it on their system. Not only does this not happen and the harassment continues, I am often attacked and told that I am lying about my identity.

PLEASE FIX THIS!!! I do not have any products from Telkom so there is absolutely no need to keep harassing me like this.