Hathway — Hathway remove my phone number from hathway broadband database

Broadband Account No [protected]

My Hathway broadband connection was disconnected last year, to be precise June 2019, yet I continue to receive calls from Hathway tele-callers suggesting some new plans and asking m to subscribe for the same. I have received few SMS as well with the festival offers. I've repeatedly told them to stop calling me but still I receive the calls. It is so annoying and I want Hathway to delete the number from their database.