Our cellphone numbers are being given out to spam companies by rewards cards

I got a random phone call today from what looked to be a regular mobile number - a young woman on the other side saying she is calling from Homegrown Solutions with offer to help me find an insurance quote that could reduce premium by 25%. I asked her how she got my number, said a company called Bio something gives them cellphone numbers linked to rewards cards like SmartShopper etc. I have been wondering for the longest how I get nearly 10 SPAM related phone calls a day and I see it's this problem of sharing out customer's cellphone numbers linked to rewards cards. I told her no thanks if I wanted a lower insurance premium I would call my insurer directly and hung up and blocked her number.