I guess I'm hacked??? Idk please help

It shows I'm playing a game I don't own, it has done this before. Then I get a charge witch first Alerted me to this and now I get achievements on that game, no one in my family has access to my login info nor does anyone else I know of so this must be a hacker, I already requested the refund and put in the comment what I said here, what else should I do?

:)