You're Harrassing me with your non stop calls. I'm not sello phasha

I have been receiving calls from Shapiro shaik Defries for many years. They are harassing me every week, they are looking for Sello Phasha on my registered cell phone number. I tried to explain to them hundred times that sello was working for my company as a driver more than 10 years ago but now he is working in Rustenburg at the mines but they keep on calling me continuously every week looking for Mr sello phasha. I don't want to end up changing my number because of them. I'm really tired of their calls This is Sello Phasha's cell phone numbers please stop calling *** *** *** I tried many times to give them this numbers, problem when I tell a consultant to call me after 10min so that I can give them sello Phasha's number, they don't call me back and I'm always driving. I can't search numbers while driving. I'm sick and tired of your calls,