Hathway — Regarding termination of account and receiving repeated harassment calls

I have a hathway account of the number :[protected]. I have stopped using the broadband service since november last year and have repeatedly told the customer care executives to terminate my account and take the router but it has not been addressed. My mother has been repeatedly receiving calls harassing her regarding legal action when all our dues have been paid. I even made them a payment recently when i told i dont want the connection anymore but they said i had a due with them. I request you to please get back on this matter at the earliest.