Wrong email address entered
I’ve accidentally put the wrong email address on Apple ID I’ve missed out a number and now it won’t let me change it!
iPhone X
What happens when you try to change it? Error message(s)?
If necessary, contact Apple ID Support for assistance. See the Apple Support articles below for contact information.
Apple ID - Official Apple Support.
Contact Apple for help with Apple ID account security - Apple Support. (Link doesn’t always load)
Get Support Work through the screens to get a chat option. You may have to pick a slightly different problem.
Apple Support schedule phone call
https://twitter.com/AppleSupport. People have posted it may take an hour or more to get a response.