Got banned for Scripting?

I haven't played on my account for 3 months or so and suddenly I received an email from riot that says I got banned for scripting? How is this possible? And no I've definitely never scripted before. I've been diamond 5-3 for 5 years or so and this season is my lowest at d5-4, so that doesn't make sense either. Please can a riot employee help. This account's been around since before season 1 was even a thing.
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