Accountant And Boss Are Refusing Overtime Due To “biweekly Pay Period”

I (22M) work at a small business in Indiana. Recently we got a new “accountant” and ever since then our checks and pay have consistently been messed up. Whether we are missing hours, being overpaid, or being paid the wrong wage, I feel like we can’t go one pay period without having to fix at least someone’s check.
Recently I got into a heated debate with the accountant and my boss over our overtime pay. I worked 47 hours one week, and 32 hours the next due to taking time off for finals. I was told I would not be receiving any overtime since we go by a biweekly pay period and overtime only counts if we work over 80 hours over two weeks. We now have several staff members that are complaining about the averaging out of our hours, and the accountant’s excuse is that in Indiana overtime is only counted over 80 hours. I’ve tried sending her any legal documents I can get my hands on showing that this is false, but she does not believe me. Before we got this accountant we never had any issues with overtime and it was paid anytime we worked over 40 hours in one week. What should I do now?
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