iphone: change appleid

because the old account does not exist!

If you have deleted it, it is no longer valid, it simply no longer exists and it no longer works.

To understand about a deleted Apple ID, see the Apple articles below:

How to delete your Apple ID account

How to delete your Apple ID account – Apple Support (UK)

-> Once your account has been deleted, Apple can't reopen or reactivate your account or restore your data.

Understand and control the personal information that you store with Apple

Understand and control the personal information that you store with Apple - Apple Support

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Get support and assistance from Apple directly, see  -> Contact Apple for help with Apple ID account security

Contact Apple for help with Apple ID account security - Apple Support

had to change to new one.

Then see this Apple article: What to do after you change your Apple ID or password

What to do after you change your Apple ID or password - Apple Support