I lost LP for winning

So I was playing League with my friend, and we played a game where I suddenly dced mid game for no reason - nothing was wrong with my internet, computer, etc. When I tried logging back in it got stuck on "authenticating." After restarting my client several times and my computer, it finally let me back into the game, at which point we came back and won the game (I was disconnected for probably around 5 minutes). But when the game was over, my client was all bugged (chat was disconnected, it showed that all the players had left the lobby even thought my friend was still in it) and I LOST 15 LP. I couldn't believe my eyes and neither could my friend, we both checked my lp on our clients and op.gg and I did lose 15 lp after winning a game. I would like not only my 15 lp returned, but the ~25 lp I would have got for winning :(

I've been looking at other forums about this and it seems that riot can't alter the lp ladder, but I'm pissed about this because it means I am down 40 lp which means 2 wins in a row just to make up for this one bug.