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If wifi calling is just turning itself on even when you have set it off, you will need to factory reset the device as it is a software issue. I actually believe that I have seen you post before if memory serves me well or it was someone else with a similar issue. To get it resolved for them we had them boot the device into safe mode to see if the problem persisted and when he booted into the normal mode it just went away. However, I believe it is probably a app on the device that is not playing nice.
You can try safe mode first if you like and if the problem is gone there is a app not playing nice. In which case uninstall apps one by one till the issue goes away. If the problem persist in safe mode, then do a factory reset. If the problem is still there after a factory reset you will want to file for a exchange device.
We certainly wanna make sure this gets resolved. You've got some really good suggestions above. Please give them a shot and let us know how things are going after that. Thank you!