POPI act having little effect

Over the last week or so, I have been inundated with calls from companies wanting to sell me insurance on a car I don't own yet (busy with application process). At long last today one of the callers was able to tell me that they got my information from Blue Label Data Solutions. It should be noted that I distinctly and specifically indicate on all my finance applications that I DO NOT want to be contacted with marketing information. I have been trying to get hold of Blue Label to ask them to stop selling my info. The phone is answered by an employee for Blue Label Telecoms, who then transfers one to an extension for Blue Label Data. No-one answers at the extension. One would imagine that I could unsubscribe online. Yes, they have such a function on their website, but my ID number is a required field and I do not want to type in my ID number on random websites. Hence attempting to contact them by phone. I want to know who sold my data to Blue Label and I want Blue Label to stop using my information to enrich themselves.