Treść zadania

Jeżeli ktoś jest Bardzo dobrym uczniem z J.Ang. To Proszę o pomoc .! :)
Czy ten opis(Emeil) po angielsku jest dobrze napisany bez jakiś błędów .. ? Prosze o dobrą odpowiedź z góry dziękuję. :

Hello XYZ,
You asked me what was my greatest (najlepszy) day in my life. It was some years ago, when I was 6 years old. I don't remember wall, but in this day was Christmas. I wanted to get the latest track for my model
cars. In this day my cousin told me, that Santa Claus doesn't exist! He laughed at me! I was sad and angry. I complained to my mother what he said. She tald to me: "Oh, Santa Claus exist in your imagine. You will see him today." And it was true! I don't know who, but someone dessed up in Santa Claus costume. I got dream, wonderful and the best, the lastest track! My cousin was very suprised and sad what Santa Claus sad him: you won't get a gift in this year, because you didn't belive in my existance and after that Santa gave me a gift! My cousin apologized me, when Santa Claus go away.
That was the best day in my life. Now you tell me about your the best day in yours life.
I want to see you soon. Bye, Dorian 1811