Harassing calls

I was due for an upgrade and went in to a store and upgraded my sim card on 18/06/2022 (still haven't received confirmation hereof). I received several calls after that from the upgrade department and keep advising that I upgraded in store. I still get a minimum of 3 calls PER DAY, EVERY DAY from *** or *** and every time I answer they hang up. This is harassment!! Stop calling me.