From Silver 4 to Bronze 3 after 8 wins - 2 losses. Why?

I feel so disappointment now!!!

I am staying up all night to play 10 reset games. I get 8 wins and 2 losses, I try hard! And when I full of excited emotion to expect GoldV or Silver I, the system shows me bronze III. WTF!!!!!!!

I really need to know why! Or it's time to uninstall LOL.

Why we LOL fans love to play it? Just because it can give us fun and we also can prove ourselves that we can do better! However, Riot can't show us expecting solution, even destroy us.

WTF Riot knows to make money, but doesn't cares about other people feeling. You must be break!