Apparently it's only Nano that's missing. Hopefully they should give you all your other coins back, unless they decide to socialise the losses or exit scam.
-snip-
Francesco (owner of BitGrail) said that only Nano was stolen and every other coin is safe.
All coins except nano are safe
https://twitter.com/bomberfrancy/status/962187877747748864
@OP: If your '50% crypto' consists mainly of Nano, your coins are gone as they got hacked and said that the only solution is a hard fork. If you hold other coins, you may be able to recover them. Contact suport and wait. It's probably going to take a LOT of time until they answer you (if they do), but there is still hope.