Hathway — Frustrating daily Renewal Calls - Hathway

Its been a month since i switched to better Broadband service, meanwhile Hathway telecallers make minimum 5 calls daily for renewal. I've told them many times that i've switched but some one new calls every day asking for renewal. Its very very very frustrating. How come these hathway dogs don't change this norm! I'm not the first person reporting this, there have been many people all around the internet shared this experience.