Pretty much my exact story, I came back 2 months ago and my account was hacked 5 years ago, at the time I even knew it was hacked because I was getting emails telling me my email been changed and password and I think display name? Not sure about display name, I don't think that can be changed? Anyways, I didn't bother because I was disappointed with the game at the time.
When I came back I contacted support on the phone, the guy was so friendly and just asked a few questions to confirm it was my account and he restored everything for me, but he was so nice and we talked about the star wars movies and what side we like playing on lol, but yeah, I was very surprised with their customer service and support, everything restored, no issues, no complaints.
I could have just made a new account but I wanted this one back since it was original collector's edition and founder. But glad I did, only took about 10 minutes on the phone which was no big deal for me.
Good luck!