Unsolicited Calls in violation of POPI Act

I received a call from Deals on Tap this morning who enquired into my having car insurance. The rookie on the phone couldn't answer my questions of them of how they got my details, and their superior was able to share that apparently I had shown interest in one of their clients' products PRIOR to the POPI act coming into being. Is this legal? How are they allowed to have our details and still have access to make unsolicited calls?