Hathway — I'm getting disturbed mentally because of continuous hathway calls

I bought hatway broadband connection when I was in need of Wi-Fi for my studies but later when I did not require I disconnected it but the hathway beggars are calling daily and pressure rising mentally. Even after blocking them every time, they are calling with hundreds of numbers. I am being mentally tortured due to the number of calls I'm receiving from hathway even after saying them that I am not interested.