I have lost all my ZKS. Where is it?

I have staked around 48.60565098 ZKS on 2021-03-06 00:06:24. After almost 1 year, I login and want to unstake and withdrawal my ZKS, I cannot find my coin anymore. However, I found the below transaction record which someone has sent me 47.418554 gZKS back with zero value and I cannot find the gZKS coin in my wallet. What’s happening? I felt this is a central financed project which can transfer your wealth anytime anywhere without your permission. Horrible!

You can claim the toke after the POS contract ended.

Where to claim? Could you please send me the portal link? I cannot find it anymore.