I got falsly demoted.

I was gold 1 and have been playing games for the last month strait. I finished playing a ranked game and it says I've been demoted due to inactivity. Note I was at 0 lp and lost the match, but I had just fallen to 0 lp from 4 lp the game before that. I'm honestly pretty disappointed in this and feel that I don't deserve to be demoted for losing one game at 0 lp.