Complaint about stolen account

I had my Sidra stolen by a thief. I did not do anything but a large amount of Sidra was lost. The thief's wallet address is: 0xa86F4A46c3349B78339B85F4ccFE7C9B915faD70 . I request the Sidra Management to consider handling this account owner to give me a fair return. Thank you. My wallet address: 0x4F971D521Aef01A7eb1Ef9c17e3346eD509807f5. He stole more than 15k Sidra.