Well from the looks of it, somehow someone got access to your account, stole your funds and vanished.

And kraken can't do anything about it, its crypto, its irreversible like they said. The best possible way to get your money back is to contact cyber crime and give your details that's your best shot. Ask kraken to provide the IP logs, check if your computer is compromised, take all necessary actions, change your email, password everything for all your accounts and use a totally different device if you can.