Rude callcentre callers

I dont even want to give them a star. The people from their call centre has been phoning me nonstop at all hours of the morning and evening. I answered. Listened to what the lady had to say and said no thank you. She was so adamant and rude. She did not stop. She got so rude asking me how can i say no thank you if i dont know the quote. After which I said i have a broker that gets me the best quotes and sorts it out for me. And she kept going. Getting ruder and ruder. Just because if that i will not use dotsure even