there are few options:
1. They scum you.
2. They are stupid.
3. They made mistake.
Write PM to admin again and if he will tell you that tx is correct and he send transaction you can just ask him to check blockchain again.
If that wont help - they cheat on you
I think there are many options, but most realistic is that admin of this pool making transactions with old wallet and he lost my coins. But who must worry about that?
I wrote him again, last one. But question is opened.