I've checked my wallet on the exchange and all my XRBs are there.
Is that means my wallet is not hacked and i got a chance to withdraw later?
Those are just numbers in a database. IIRC, Raiblocks has less than 4m XRB/Nano in their wallet and they owe their users ~17m. I heard some people saying that MAYBE everyone should receive 20% to 25% of the owned coins back. But it's only a possibility and the risk of not getting anything is high.