Its better to create another thread on scam accusion then provide a proof that you got scam by this satoshi dice, then people can discuss about your problem because this 0.4 btc is a huge money, you also mentioned about that you already contacting the support but its appears that its never chat back on you.
In fact the OP did not send 0.4 BTC to the Satoshi dice, but only 0.04 BT and did not present other evidence.
OP transaction
https://www.blockchain.com/btc/tx/f8ca704cc3c877d8e8bef695414ee8953eeda2a1d9179a0f772499895e55d27dNice catch that is just 0.04
BTC not 0.4
BTC as the OP claiming it is clear in the transaction maybe he is not familiar with onchain casinos there is nothing hide.