cellular data doesnt work on ios 14.5 anymore!

I have been having this problem since 4/28 and reached out to Apple directly on 4/29. After 3 subsequent visits to the Apple Store WTC in NYC and a number of "genius'" being involved they confirmed un-officially that the problem is with iOS 14.5 and 14.5.1 and as far as I'm aware 14.5.2. In the store they had me backup my original iPhone 12 to my MacBook prior to their resetting it to discover that the problem was real and I'm not crazy. Switched to a new phone, same problem. I've of the reps moved my SIM card to a 12 Pro and it worked, but that demo phone was evidently "not" running iOS 14.5. After more calls to Apple they agreed to swap out my phone and I would pay the cost difference. Got to the store and nobody knew anything. They ended up comping the difference in cost but the 12 pro max has the same "no cellular data" problem. They swapped out another phone and didn't do the upgrade to 14.5.1 and all works fine like it did before the update, but my backup taken when my original phone was using 14.5 cannot be restored. I'm screwed and Apple could not care less. I can live without things in the backup until fixes are made that allows for the restore. This weekend I purchased a new Apple Watch 6 and I'll be damned but it wants a version of iOS higher than 14.4.2 in order to initialize and set up the watch. It's unbelievable that Apple can issue such an advertised major upgrade without sufficient testing of such a big ticket item with a major carrier and then be so apathetic in regards to a fix. I've got an Apple Store appointment now to find a work around using a demo phone at the store to initialize the watch. Hopefully some solution will work, but at this point I have little confidence in Apple and finally admit it's time to migrate to Android. High prices shouldn't come with hassles.