Do you have an authenticator on your account? If you don't then I think you need to get one. i speak from plenty of personal experience. Even though i never fell for phishing attempts my Wow account alone has been stolen multiple times when I played. Once it was stolen by someone in China and sold to someone in Russia. The last time someone had stolen it the GM told me what the people had done to it, because I had found it "banned"
The people that stole the account use your own account to promote gil/money selling. Which in turn (they don't have to pay for services and they also can steal your gold) If you see someone out there shouting for gold or gil it's because their account has been stolen and now Gil sellers are using it. Or they are just stupid enough to pay 60$ for the game just to do so.
Chances are they likely deleted your character. "Suspicious" activity so early in the game could mean gil sellers. There were people in Early access already promoting the sell of Gil and they had regular names like "Dawnstrike motherborn" or whatever. Normally they use names like "fhsfoush asdfhsiudflhsf" but it's regular names :/
I'd speak to a Gm(IF you can. They are pretty booked up right now

....) to try and get it solved. Try getting an authenticator too. You can get a ditital one that goes to your phone when oyu need to log in I believe.