Apple Watch cellular

It’s been 4 days now since I bought my Apple Watch from the xfinity store and still cannot connect to the cellular service.  I tried to activate it myself when I got home and kept getting the uh oh screen so I called the number they gave me and the rep told me they are not equipped to handle activations (why do they give you this number if they can’t help) and I would need to bring it back to a store.  So I called the xfinity mobile tech support just because I figured the last rep didn’t want to do his job and the mobile rep told me same thing and to bring it to the store.  So I brought it to the store and they called their support and apple support with no fix and wasted now 6 hours of my life that I can’t get back talking to phone reps and store reps (store reps were super friendly and treated me very well) .  So like I said it’s been 4 days and still can’t use cellular feature even after pairing and re-pairing device putting it on WiFi and off WiFi and every other trick I read online that worked for others and I find this totally unacceptable that there is still no fix for this.  Up until now I have had no problem with xfinity mobile but this is a big problem to have and hopefully not get charged until this issue is fixed.  But if someone has any info on ways that worked for them I am all ears.