Wait, so they are saying the funds were stolen? Because according to the blockchain, the funds are still there.
https://blockchain.info/address/1PZmRkTrBv8sSn1mgYtjeVwJLtxwUGEHr53.46700611 BTC to be exact.
I think they are just misunderstanding what you are saying. Because even they admitted the funds were never transferred out of your account.