Apple ID
My old Apple ID I think someone is using it and it’s not me can you help
You might want to consider changing your password and making sure it is a strong one. You can also add 2 Factor Authentication to your account for more security. If the attempts continue, you might want to consider a name change.
Link to contact Apple Support in the article.
Apple ID has been compromised. https://support.apple.com/en-us/HT204145
Apple ID Password Change. https://support.apple.com/en-us/HT201355
Note the restrictions in the article.
Apple ID Name Change. https://support.apple.com/en-us/HT202667
What to do after you change your Apple ID or password - Apple Support https://support.apple.com/en-us/HT204071 I
suggest doing this before you change your Apple ID or password.
Apple ID -Two-factor authentication https://support.apple.com/en-us/HT204915
Two Factor Authentification availability. https://support.apple.com/en-us/HT205075
Apple ID - Using app-specific passwords. https://support.apple.com/en-us/HT204397
Apple ID - Two Step Verifications FAQ https://support.apple.com/en-us/HT204152
If you don't know the password, enter the Apple (iCloud) ID and click Forgot Password.
Apple ID - Manage https://appleid.apple.com/#!&page=signin
Apple ID – Forgot Password https://support.apple.com/en-us/HT201487