Another phone found logged in my account without my me knowing and I removed it

What actions should be taken place?
Hello Toyon,
Unfortunately, from your recent message, it was not clear to us how we can help you. Could you please specify your request and provide us with more details? Thank you for understanding. We look forward to hearing from you soon.

Hello Toyon,
Unfortunately, from your recent message, it was not clear to us how we can help you. Could you please specify your request and provide us with more details? Thank you for understanding. We look forward to hearing from you soon.