Ranked Series Promotion Unsuccessful?

SO, I was playing the game last night and doing my thang in my series. I won my first game and loss my second game which would have left me with a remainder of 1 game to play considering that it is the best 2 out of 3 games. well I only got to play 2 games out of those 3 games. my match history clearly shows that I loss 1 out of my 5 previous matches including the series games. how is it possible that I was not given the opportunity to play my 3rd game to try and win my series for promotion. please someone explain this to me because I am at a loss of words and I honestly have no clue what happened. I will attach a photo of my match history proving this. I have yet to encounter anything like this in my 4 seasons of playing league of legends. I have already submitted a request from riot and I am waiting on a reply. maybe there is someone who ahs experienced this before and knows what the problem is. thanks for reading.