harassing phone calls

I went on hippo to get an idea of car insurance. I'm very happy with my insurance at present but I'm not going to phone the poor broker every 5 minutes for a quote on a car that's not even bought yet. I have to budget before I buy. But I knew from experience that Hippo will start early the next day and phone nonstop until the night even though I did not consent to this. Lucky for me I had all phrases, extensions and numbers blocked beforehand. You would think the marketer will get the idea sometime and stop phoning but no.... Please don't phone potential clients a 100 times a day it only pushes them away