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Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
Unfortunately, and we get this question all the time, when a business you are dealing with makes an accounting error or mistake and they find it, you are still liable to make proper payments. To not hold you liable to pay the difference based on their mistake would be considered in court what they call "unjust enrichment" because you received the service you agreed to pay a specific price for at less of a cost because of a mistake by the business.
So, I am afraid that if they discovered a mistake, you will remain liable for making the payments owed.