Duplicate text messages

I am using an iPhone 11 Pro, but had the same problems with iPhone X, before I upgraded the phone.

I have two issues and it may be because I enable the WiFi on the Phone settings:

1. All incoming calls are sent to voicemail.  I do not get the call; just a notification when a voicemail is received.

2. I am getting up to 10 duplicate messages from senders not using iMessage.  

I have been to the Genius Bar with Apple and no success.  I have also filed an open ticket with Verizon but have not received a solution.  I have reset the network several times, re-installed the iOS software, and even replaced the WiFi devices.  Still no success.

Any help would be appreciated.

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