Removing persistent second Apple Account from iPhone and iCloud

• What are you seeing with the files from iCloud?
• The password for your Google account and Apple Account are 2 different things. Changing the password on one has no effect on the other. It is not clear which account you are referring to where the password is changed.
• You can review devices that are signed into your Apple Account by going to Settings > [name on top], and scroll to the bottom. Any device that is not yours can be removed, and you will want to follow up with changing your password.
• Where are you getting the information that it involves someone from India and how it is tied into your iPhone.

Feel free to provide screenshots of what concerns you as long as it does not contain any personal information, like email addresses. Without any further information, review the information provided here:

Personal Safety User Guide - Apple Support