Bidvest Insurance Sales department should keep clear records

I have recently bought a car and already took out the insurance of my choice. Somehow Bidvest Insurance got hold of my number (without me even asking for a quote) and they just kept on calling me. Once to three times per day, every day for the past month (even over weekends). Every time that truecaller notified me that it's Bidvest, I hung up and blocked the number immediately. The next day they just called from a different number, one which isn't blocked yet. Honestly, if someone blocks you more than 30-90 times in one month, surely somewhere someone should get the message that that person is clearly not interested in their service???