WON A RANKED GAME BUT INSTEAD OF THAT I L-16 lp

So i was playing a ranked game and my internet complete crash so i restart lol client and when i came back we still in game after a team fight we won the fight and finally we won the game but in the stats screen i saw this victory/defeat msg i was like this

VICTORY -16lp

Like please thats not fair that wasnt my fault i came back and i won i want my lp back RIOT please.