Arosa 1.0 doesn’t start after Frost

Last Friday, after the heavy frost, my oil lamp and the warning sound went on after which I had started the car in cold condition.Motor blocked off and off after a few seconds. After another attempt, the oil level was the same after 50 meters drive, then ADAC and off to home. Today, I thawed the car in the garage and made a start attempt. Result: engine just doesn’t turn on anymore. Since it turns I assume that since who can give me information about possible damage recovery caused by the frost. Thanks in advance. Seat Arosa 1.0 6H 50 PS Ez 1999, 230000 km