MTN does not respect their clients or the law

MTN is an absolute joke of a company that has no regard for customer privacy or the POPI Act. I have received around 30 calls now from MTN and various 3rd parties on behalf od MTN regarding my contract renewal, which I told them I do not want, yet the calls do not stop. WHY IS MTN GIVING MY DETAILS TO THESE 3rd PARTIES WITHOUT MY CONSENT? This is also not a once-off problem because my wife has the exact same issue. We have both asked that MTN and these companies stop harassing us, but the calls keep coming.