Hathway Cable & Datacom — mental harassment due to incessant calling by hathway staff

I had a hathway connection around 2 years back but disconnected it due to multiple internet and service issues. The internet speed would be very slow and it would often not work at all. The service personnel were no help.
I finally stopped recharging my account and asked them to deactivate my account.
To date, in july 2019, i'm still getting calls and messages from hathway people giving me offers and asking me to renew. I have told them multiple times that i don't want it and to stop calling me so much but to no avail. I easily receive 3-4 calls from hathway every week even though i have asked them every time to remove my name from the caller list.
This is mental harassment. I might be driving, in a meeting or doing something else but they keep calling every time.
And when i say that i don't want it, they either respond very rudely or keep pestering me to stay on call and listen to their offer.

Hathway - i don't want your connection or offers. Please stop calling and texting me!!