No need to repeat the advice that you have already received. The following might help at this time though. Worth a try.
On your iPhone......
Tap Settings
Scroll down and Tap Apps
Tap on Phone
Make sure that the setting for Calls on Other Devices is Off
Close out of Settings
Now Tap Settings again
Tap Apps
Tap Messages
Tap Send & Receive
Make sure that the only check mark is next to your phone number
Close out Settings and then power off and restart your phone.
Repeat the same process on your wife's phone for both Phone and Messages. On Messages, make sure that the only check mark is next to your wife's phone number.
Run some checks on both phones to see if things are any better.
If you still can't receive calls from your wife's phone, check on your phone to make sure that you have not accidentally Blocked your wife's phone.