That is not a good experience, though, the two guys should not be blamed for it. but I guess the client was in for something fish, it is well any always. One just need to be extremely careful with all transactions in this exchange wallets, because you never can tell when they have planned to scam you, as they have ways of manipulating the whole process. We should be mindful, watchful most especially pay attention to details in terms of making transaction to any address.