I got demoted after a day

Yesterday i reached platinum 2,right after i won 2 games and lost 4,after 3rd lost game i had 1lp after 4th-0.Nothing weird about that.Im waking up turning on LoL and what do i see? ,,U have been demoted to platinum 3 in solo/duo" .Its like if i quit game yesterday and now i have been informed,but i didnt quit.Is there any chance i will get my lp back?[zombie-nunu-bummed]