Bad service

I keep receiving call from this people that I don't even know why are they calling me, I have spoken to the several times to stop calling me since I don't have anything to do with them. I called in today and spoke to Makgotso Ngange who was just arrogant and spoke as if I owe them something. I asked her to remove my number for their system of which she confirmed that she did, I called again to get the name of their organization and spoke to Nofezeko Tungci who was more arrogant that the 1st one, I'm not sure if that is one of the qualities that this company is looking for when hiring people. I asked her to spell the name of the organization she's working for but she told me she's not going to do that after she asked for my details of which I didn't have a problem to give them to her. I had to google the name of the company because on the sms its only reflecting as SSDA and provided the number ********** 001. I want this Nofezeko and Makgotso to call and apologies for their stubbornness and unprofessionalism when addressing the customer. I also want them to stop sending me sms's and calling me. They are really harassing me.