Re: Password reset : I forgot my icloud password and the number assigned to it is not correct so it doesn't exist.
Your Apple Account is the account you use to access Apple services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more. It includes the email address and password you use to sign in as well as the contact, payment, and security details you use across Apple services.
You may be able to sign in with your Apple Account password:
Eg: You are likely signed in here with your Apple Account details, as well as in Messages, FaceTime etc.
You are likely signed in to your iPhone with your correct details:
Sign in to your Apple Account on the web or in your device settings - Apple Support
See if you can sign in to iCloud on the web using your Aopple Account details:
Sign-in webpage: https://www.icloud.com
You may be able to get a verification code on your device:
The verification code may be displayed automatically on your trusted devices
Get a verification code and sign in with two-factor authentication - Apple Support
If you have forgotten your Apple Account password see if you can reset that:
https://www.youtube.com/watch?v=4w37whqIAJ0
If needed:
Try to verify your account details, and reset a forgotten password from this website: https://iforgot.apple.com
or
See what to do: If your Apple Account is locked, not active, or disabled - Apple Support