WHAT'S WRONG WITH THE GAME

LAST NIGHT I COULD NOT ENTER THE GAME AFTER SELECTING CHAMPIONS. AND TODAY, NOW, I CANNOT EVEN ENTER THE CLIENT. WHAT HAPPENS? I JUST PURCHASED SOME POINTS YESTERDAY. PLEASE, MAKE THE GAME BETTER, NOT RUIN IT. I PLAYED IT FOR 4 YRS, DO I HAVE TO SAY BYE-BYE? GIVE ME THE CONFIDENCE TO CONTINUE.