Blatant harassment and zero regard for personal info privacy

For the past two week they have been calling me. I have answer calmly and ploitely 4 times to tell them to please stop contacting me, I do not consent to them having my number. Inbetween I have ignored 8 of their calls. Yesterday I firmly told them that they better lose my number. Two hours later I answered yelling at them to stop calling me. They tried calling me again just now. Their basic lack of respect for my privacy and going against the POPI act is disgusting to say the least.