Welcome to FSM!
![Smile [:)]](/FSM/CS/emoticons/icon_smile.gif)
My first suggestion would be to return the kit directly to where you got it and demand an exchange. A kit missing a sprue is like a car missing a tire! Demand satisfaction!
My second suggestion would be to contact the Hasegawa distributor in your country to inquire about replacement (or "placement" in this case, as your kit was missing an entire sprue!).
Good luck!
![Big Smile [:D]](/FSM/CS/emoticons/icon_smile_big.gif)