Hathway broadband bangalore - Hathway Broadband Harassment Multiple calls every day after disconnection

Had informed Hathway broadband customer care to terminate the connection as I moved back to Delhi from Bangalore. After multiple calls, no one came to collect the modem and disconnect the internet. After waiting for more than a week, I spoke to them again and informed them that I will be taking legal action if the connection is not terminated. I was fed up with getting calls every day multiple times, asking me to renew the account. However, someone did come and collect the modem but till now I am getting messages, mails and calls from different people. I have been blocking all numbers but they call from a different one everytime. I am being harassed and there is no space left for me to breathe.