PSA: "I got hacked" is not an excuse when you get banned for 3rd party software
And there are 2 very good reasons for this:
REASON 1: 99.99% of all "Hacks" are a case of "user gave away his account information".
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Either willingly (the famous "my absolutely, 100% trustworthy friend who would neeeeever ever do something stupid")
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or by falling for a phishing attack (fake website and so on)
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or by re-using account credentials (username/password) in another online service
In either case, its the users fault.
REASON 2: No one can prove that it wasnt him in the first place Lets face it, "I got hacked" is just such a convenient excuse for a cheater isn't it? Especially in a world of online anonymity, where no one has to provide credentials, and everyone was abroad without internet connection juuuuust when it happened (proof not included).
Point is, Riot cannot know, and frankly, its not their job to verify such claims either.
If you actually believe you are among the 0.001% of people who genuinely got "hacked", by all means, make a request to Riot support. But if either of the above points is accurate in your case, don't expect them to help you, because frankly, there is no reason why they should.