How many games in a row do you need to INT before getting any action

Just had a lovely ranked game whereby my support just kept running down the lane giving free kills. He went something like 0/19 before we surrendered. Upon inspection, he has done this for his past 5 ranked games in a row. Obviously reported, but had nothing back to say any penalty was issued. So i just checked his live game and hes doing it again now. How many games in a row before any action is taken??
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