Document security violations
Make sure all evidence is stored carefully and discretely so your abuser does not get a hold of it. There is more advice on this under How to Document Violations Of Privacy.
Method 1: Take screenshots
Did you receive an email from Google saying someone in an area code you don’t recognise was trying to gain access to your account?
=> Save this email for your reference, and take a screenshot of anything else that seems fishy to you.
Method 2: Record voice calls
Are you receiving voice calls by an unwanted or unknown person that is making you suspicious or uncomfortable?
=> Record these calls with an app in order to document the harassment.
Recommended Apps and Methods
Please note: In some countries it is illegal to record phone calls. Please check the laws in your country before recording any calls.
Method 3: Keep a diary
Make sure to keep track of what is happening to you, it is important as evidence to show how this has been impacting your day-to-day life and will help you remember important details that can help your case.