[antonye]

Probably just a bulb gone or connection that has shorted, hence it blows the fuse each time.

If you're not going to take it back - which would be the best bet as if they didn't put it back together right then they can fix it! - simply take the headlight out and check the connections on the bulbs and the connector are fine. Refit the headlight unit and test it before putting it all back together again.