Hathway Internet Services Delhi — nuisance case disturbing customer even after closing account 2 years ago

Address:

110009

I am receiving constant phone calls and messages from hathway daily to pay amount and get promotional GB of data. I have closed my account([protected]) for phone no [protected] in the year 2017 and last four months I have been receiving messages from Hathway broadband services to renew. This is so annoying.
Its been 2 years since i stopped hathway wifi broadband.
Kindly urge Hathway delhi broadband not sending or stop messages to my personal number. I have already reported this issue to the customer care people, no one responded. Kindly do the needful...