Ranked Play/climbing the ladder

Hey everyone. I just needed to talk about climbing the ladder and how frustrating it can be and see if other people feel the same. I am not an expert at LoL by any means but i enjoy a lot the competitive and sports-like atmosphere this game has to offer. I have been playing a lot more ranked recently, and i am starting to think the system for climbing the ladder is flawed. today for example i was sitting at 13 points. won a game and was then at 23 points. I lost my next game and that sent me down to 3 points and on the hotseat for another demotion. My only demotion came from a full day of ranked play that i won the majority of (about 70/30) i ended a huge win streak with the begginings of tilting and lost the last 3 games in a row. after winning about 7 games prior, i was demoted. Im wondering if anyone else has similar experiences climbing the ladder and knows how frustrating it can be to win your laning phase and fall flat with a bad team and lose the points you just aqquired by working hard for a 3 game win streak. thanks for your time and any information on how the ladder system works would be appreciated.