Hey there Smellthat,
Sorry to hear about that compromise. Good to see you are back in control of your account though, and if you haven't already, then I would suggest looking into setting up a
Blizzard Authenticator as an extra layer of security.
As for your keybinds: the default ones will actually use numbers 1, 2, 3, 4...etc for the standard bottom left action bar. Clicking the 'Reset' button will change any keybinds back to this default, which those pesky hackers may have done.
In that case the only option would be to remap your keys to how you had them/want them to be now.
Once done, do make sure to log out your character normally (Esc > Log Out) and not hit Alt + F4 or the Windows top right X marker. That would not save the changes properly and would mean having to redo it all again on your next login. :)