Hathway Cable & Datacom — unwanted spam sms

Address:

Hinjewadi, Pune, Maharashtra, 411057

I used hathway last, in year 2015 and moved to another city. Now after 4 yrs, i am getting these annoyed messages everynow and then even after blocking the source.
E. G. Dear customer, renew your hathway ac no 11096* in 50 mbps monthly plan in just rs 499 + gst*. Call [protected] t&c apply

I don't want or never contacted hathway anyway, but these sms are unstoppable. I don't want to talk to hathaway executive as well as again these sms will increase instead of stopping them.