soooo dose any1 know what the hell i did to piss riot mms?

apparently i get to s2 around 86+lp even promos, then get shit teamed to oblivion...like my "mmr has droped" mainly from the losses not from actualy play on my part.....like i went from s2 to s5....with only 1 or 2 wins from the teams I'm paired with....i get "it's your fault" and "it's a team game" so hows that freggin work if its' my fault yet i just get idk diamond teams to fight vs my b5 teams that i get, then how? Is there any way to get MMR up w/o winning, i mean it only goes down when you lose even if you go 18/0/30 or something....you still lose...it's a broken system that doesn't count for actual skill level just wins/loss ratio. then expects you to carry every game with people who are in bronze or worse, vs fill silver+ teams can we please talk about how riot needs to fix this issue.