The account / item restore limitation only works up to 4 times, UNLESS you were not at fault. You can get hacked a billion times and as long as they find an evidence, ( Password changed, someone else connecting to your account with a different IP ) then it doesn't count towards that. They do all the investigation themselves, no need to contact anyone. An in-game ticket will do the trick, it'll be escalated and usually takes from 2-7 days to get all your things back.
If you haven't already done it, change your password .