Hello and welcome to Apple Support Communities leafromanchorage,
We see that you’re getting unwanted messages on your Apple Watch. We understand wanting to get this issue resolved, and we’d be happy to help.
You mentioned that you have silenced unknown callers on your iPhone. Next, we’d like to have you try to block these number using the steps in the article below.
Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch
If the issue remains, try unpairing your Apple Watch from your iPhone, restarting both devices and then pairing them back together.
Unpair and erase your Apple Watch
Thank you for using Apple Support Communities.