How to deal with a 14 loss streak mostly caused by others?

I have a loss streak in both normals and ranked games ever since I reached platinum 4. I truthly feel like I am placed with utter trashy people in both gameplay and their behaviour, and I am sick and tired of this. According to the support team it was due to bad matchmaking, but this is like my 3rd loss streak of over 10 matches in a row. Anything I can do about this, or is this just a matter of bad luck or a badly designed matchmaking system?
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