Relentless phone-spamming, POPIA be damned!

Somehow, somewhere I was added to this company's phone list. I suspect somebody tried to commit *****, as they keep using my second name. Now I am getting daily calls from Phonefinder claiming I app**** for a phone contract. I have explained many times that I did not apply and that I do not want to apply, but the rude CallCenter is relentless. Sometimes they sick the AI-lady on me. Seems they are associated with Clientele Life, for some reason. If anybody has got a suggestion how I can get rid of these people, please advise. Blocking numbers does not help, as like all call centers they rotate the numbers displayed.