Series 3 Apple Watch Won’t Unpair

I’ve an a series 3 Apple Watch a few years now, but I stopped wearing it 3/4 years ago. I decided to start wearing it again and long story short it won’t unpair. It was connected to my old phone that I don’t have anymore, so I erased the watch to use on my current phone. When I use the app to pair it to my current phone it won’t complete the unpairing process. The app keeps starting the process from the beginning again. It’s under the same Apple account and have tried everything from their website to try sort the problem, any help would be really appreciated!