Call a good local auto locksmith. They will be able to resolve this by reading the ecu and coding a key. If you can find Fiat dealer even or talk to Fiat customer services Tel 00 800 3428 0000 they will be able to give you the cars main code if you have proof of ownership and then lock smith will be able to get you a key to start the car. Good luck. Alternatively do you have breakdown cover?
Google auto locksmith Helsinki and severa;l 24 hour numbers come up.