it started working for me after i put my sim into another device (my friends pixel) tested it on his and everything was working. popped it back into my device and boom it was fine since. rogers coreys idea was my next thought to try ad no one else was having the problem.
Did you ever fix this problem? I'm having the same issue. If Enhanced LTE is on, no calls come through when on WiFi. If you learned anything new it will save me a lot of time. If you're still in the dark, I will call support and gather new information.
I spoke with my account rep (corporate client) who directed me to the our Tier 2 Enterprise technical support team who indicated that in their "database" that VoLTE is "TBD" for if it's supported (even though this page listed April 3rd as a supported date.) - http://communityforums.rogers.com/t5/forums/forumtopicpage/board-id/OSUpgrades/thread-id/1