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Please help me out with this
try to go to google android device manager from there you can locate and or erase your device. you can do similarly with Myxperia service https://myxperia.sonymobile.com/
Hi @akihiroelijaninfa, I am very sorry to hear about what has happened. 
In addition to @nolramlb recommendation above, I recommend that you get in touch with your operator to see if they can block your IMEI, as well as contact the police.