FC Mobile Account In Another Device

So you know how when you logged in to ea account and played fc mobile your account will always be there in the device if you didn't delete the game data right? someone gained access to my fc mobile account with this method, and i can't get them to get out of my account, i tried to fix this by reaching to ea help but they only told me to reach out to google play support and immediately ended the chat. (which couldn't work also) so what should i do?