key broken

I own this laptop under warranty for another 2 months. The key of the point (.) (;) has suddenly been broken  and I can't fix it with the white plastic part. I think that the last one is ok. 

How can I solve this problem? Is it possible to have a new key for the keyboard? 

Thank you in advance.

Maria Olympia Vakirtzi

+39 3401845110

marolia_vakirtzi@yahoo.gr