ACCOUNT HACKED

While checking my awards section i found out that on 24 i got award of completing my lessons but i never completed my lessons
pls tell me how can i know if someone else is using my same account
Almost guarantee you were not hacked
You can check recent logins from Settings, Manage Account (at the bottom of the page) and Manage My Data
While checking my awards section i found out that on 24 i got award of completing my lessons but i never completed my lessons
pls tell me how can i know if someone else is using my same account