Impossible unless you tried to transact during the fork. Check your wallet on a block explorer and it should be there. There is no way for it to just disappear without having done anything. If you can, show us the address, and we can help troubleshoot, otherwise, this is just a rant without any evidence. Next time you want to complain, do it properly so you can get the desired assistance. Do not understand why people just open threads to complain like this.