3rd party programs but no evidence

Basically, my account got permanent suspension for using 3rd party programs, which I never did, so I asked riot to show me THE evidence and they said "According to the investigation that was conducted, our system has very clear evidence that this account was engaged in the usage of scripts, hacks, exploits or unauthorized third-party programs in the game, which is a violation of our Terms of Use. We cannot disclose the method, results or evidence of this investigation as this can compromise future investigations for future cases.". SO, "Although this marks the end of the line, we’re confident that with some reflection you will be able to avoid this kind of situation with whatever new games you decide to play." I have never used any 3rd party programs and they are just telling me to move onto another game by saying we have very clear evidence, but can't show you oops too bad just get over it. ???????????????????? Is this really how they are supposed to act like? Just because they have many players doesn't mean they can just tell me to play different game when they aren't even showing me the evidence :)