Rahulisola, thanks for the link. I was able to fix the issue by doing a factory reset. Not sure what caused it but now I can disable wifi and the call stays connected. Although I found it odd that wifi calling was forced enabled during the reset while I was setting up the wifi network. Disabling it after the factory reset setup did prove it was really off this time. I also noticed that I'm not seeing "HD Voice" which I know assume is related to wifi calling. As I've seen HD Voice whenever I was within my wifi range during a call.
Also, Lorettaa thanks for looking into this as well. I really don't know what caused the problem but I'm glad it's fixed now
. No more of pitched ring backs while making a call. And no more odd echo voices when talking. And most importantly no dropped calls.