Apple Watch ultra will not work on cellular

I have an Apple Watch ultra that I believe is defective. It’s never worked on cellular and I found out after I tried to use it independently of my phone. Carrier had me wipe and re connect my watch to my phone, step by step. Did not work. Carrier had me contact apple, who did their own troubleshooting… did not work. I sent in my iwatch, and it was sent right back with a generic response “we could not duplicate problem”. I take thé returned watch back to carrier to have them once again set up cellular on my watch. Watch makes no calls, no bars for carrier service even though it is now showing as connected. Called FAIL when attempted. Calls to my phone while my phone is off do not go to watch as they should (call went straight to voice mail. Same issue as I had when I first sent it. Called apple, and I’m told to send it back to them.

The Apple Watch ultra is defective! Apple refuses to talk to carrier to identify the issue. Watch is under warranty and I want a replacement. I’ve been paying for a service I do not get because the product is defective and apple is not connecting the watch to an actual carrier connection to test the watch. This is a defective product and I have read several other complaints of the Apple Watch ultra not connecting to cellular and working independently as it is said to do. Please replace the watch! It’s under warranty.