Thameslink fined me for sitting in wrong seat even though I had a ticket

Can you please help me as I am currently being prosecuted by Thameslink for mistakenly sitting in a first-class carriage?I am an international student from South Africa and fear my scholarship could get revoked over this.I had a valid second-class ticket and simply made a mistake.Rather than kicking me out, the ticket inspector quickly became rude and very antagonistic.

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