Hathway — Repeated calls over a year

I'm getting calls from past 1 year to recharge Hathway account even after I say that I'm not in Bangalore that I couldn't use. Then they ask the router back but I was told my their representative while taking connection that the router will not be asked if I use it for more than 6 months.

So I asked if I could pay for the router as I'm out of city but they denied saying that router has to be returned. Meanwhile I keep getting calls everyday atleast 3 times

Also in one conversation their call representative has made me pay 540INR saying that I won't be getting calls anymore and you can continue whenever you come to Bangalore. She took me to my Hathway account and made me pay money but in the very next month I started getting calls. They made me pay money by saying all these lies. When I told the same in the next conversation by another call representative they said they can't trace who called me . How pathetic it is