Hello and welcome to justanswer. My name is***** will be assisting you today. Please give me a moment while I review your question.
Sorry to say that there is not system to report such activity in gmail/google but you can prevent this from happening again by changing the password ***** account recovery options.
Do you want to do that?
Note: - Please reply using the box below.
Sorry there is no option to report such activity to google,sorry about that.
Did you see this unauthorized access after you changed the password?
Did you change the password ***** options like mobile,email and secret question ?
Also did you check if your emails are being forward to any other email account?
I will guide you to do that
Are you currently signed in to your gmail account ?
OK then open this link : - https://security.google.com/settings/security/secureaccount and it will show the recovery options,in that see if its showing your mobile and alternate email used in it for changing password?
If not remove the current and add yours and verify it.
Once that is done let me know
Good,you did change both and verified both too? if not the unauthorized user can again change the password ***** regain access.
Now see if the alerts to such unauthorized is sending to your phone or not using this link : - https://security.google.com/settings/security/alerts
I am little bit confused here so please make sure you changed the password,secret question and its answer,account recovery phone number and email to yours active mobile and email.
Then see if the number you gave to alert you is yours using the link i gave above.Once you have changed it click on Done.
Then let me know .
There is one more setting you need to check which is to see if anyone else is forwarding your emails to to his
Click on this link to open settings page of gmail : - https://mail.google.com/mail/#settings/general then see if there is any address listed in forwarding and pop up/imap
If you are satisfied with my services/answer please rate positively using the options just below this chat box select the rating and click on submit. If you have any further questions or if you are not satisfied please reply back to me and let me know what else you need to know or the reason for not satisfied so that I can help you better.Have a Great God Blessed Day.