Hi guys, would anyone like to help me on writing an apology letter? My first language is not english my english sux.

I need to write a letter to apologise for my son for playing online flash games using the school computer after school. How should i write?

Mr. Teo,

I've been informed by my son, Goh Bin from class 2F, that his account has been disabled by the school technician as he has been playing games in school. I understand that the school computers are meant for educational purposes and I am sorry for my son's actions.

                                                                                                                  Yours Faithfully, 

                                                                                                                   Goh Ba

lolz, is that ok? should i add that i have given my son the $10 to activate his account? how should i do that? if u do spot any grammar, spelling mistakes, pls tell me, im sure there is, just that i cant find. is the letter too short? or dun seem sincere? I cant think of any more to write. pls help me and post ur suggestions pls, thx alot