Riot can you just permanantly fking demote me from diamond?

Like seriously, I hit d4/d4 promos and its just a straight loss streak back to p1. LIke, just a giant blue/ red block in my match history. This bs has happened at least 4 times just in the last month. The current matchmaking system isn't matchmaking at all, its just a bs rubber band system where difficulty is completely artificial. Honestly at this point I think I'm just gonna play out the rest of this 20 loss streak cuz that's how long the last 2 lasted. Then I'm gonna quit this game for good, I want a game with an actual matchmaking system, not this artificial bs.