Hathway — Repeated calling. Unnecessary followups

I have been using Hathway internet for past few months and now we have decided to relocate. I have informed them that, I will recharge once I need. But still I am getting 4 to 6 calls per day. I have informed almost 10 times that I will recharge if needed still they are calling like crazy. Not sure if they have basic sense about customer management.