Apple Watch calls go to Voice Mail but can make calls from Watch when away from phone

Purchased 2 Apple Watches directly from Apple 2 years ago and after many calls with Xfinity got both of watches working with cellular. Recently when watches are away from phones calls can be made from Watch but cannot be received-calls go right to voicemail. 
After 4 calls with Apple and 5 with Xfinity problem still exists. Apple thinks the eSims on the watches need to be re-provisioned. Tech support is terrible, they cannot figure it out. 

Can you help with this issue? 
Thank you!