i got scammed for my frozen levi

I recently logged on to fisch and i hooked in a frozen leviathan and i guess someone saw the message and they said trading a kraken for frozen levi and i dont know the trading values so i said yes and he told me to go first as he had a "vouch" with him so i did but he took my levi and left the username of the scammer is DJTed12(Igris) and the vouch is RepeLive123(Lgod)