Calls every day is a shaw phone

Calls everyday a few times, rings twice and stops.  I tried calling back and got the same message "The number is not in service".

I'm a female and have been getting calls from this number for 3 days. Day and night. Person hangs up on me. Last call 15 minutes ago and they just listened to me. I tried calling the number back and it says the number is out of service.

I got the call as well but the caller kept silent. Weird.