First when I contact support they say " we only support ERC20" kind of trying to convice me that the funds are totally lost... So I tell thems the priv Key and the public adresses are the same for ERC20 and Binance Smart chain, and for my surprise and here is why I think if they are not a scamm exchange they just act like.... they ask me 500U for "handling fees"
The first mistake you made here was to send your funds to a different network. Since they say guidelines before depositing on any exchange, if you send funds to a different network, it will be lost. So here you have made a big mistake.
And secondly, it certainly can't be a professional way for an exchange's team to ask for money from their customers in this way. So everyone should be careful about this exchange.