Hathway — Tele calling nuisance after disconnected

Address:

Tamilnadu, Chennai

I have disconnected and handed over the modem device of Hathaway almost 15 days back because of their tele calling daily nuisance.

In a day 10 to 15 person calling from different no event though I said that my connection terminated but they simply not bothered and ask me when u are going to recharge.?

At one time I was driving my car and saying that I'm in driving, still they didn't care and I got 11 persons called during that driving itself within evey 5 mins gap.

It's kind of super annoying and harasment and seems like no one can do anything about them kind of attitude they show.

Are the hathway tele calling team such kind of so powerful and no one can deal with them for their human harassment?

Can anyone help me here to stop this nuisance and take action on them please?