Closing an account permanently

Hello, Long story short I have had some of the worst luck these last few weeks. Gold promos all the way to silver 3. Some of the losses my fault, but the majority a string of afk's and extreme feeding, like 1 and 22 kinda stuff from teammates. Anyway I have found it impossible due to the failure of the match making system to actually work in any meaningful sense at giving me a team with a chance. Because I am getting fueled with anger, I want to stop playing and not have the urge to come back. Can riot close an account for good if you ask?
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