<human>: Condense the text into a few key points

Okay, here's the low down. I'm 18 years old and go through a local credit union. I recently got a job and had to buy dress pants and black socks. The next day (a Thursday), I bought myself dinner at Burger King after a long day at work. Friday, I had to get gas at a gas station to get home. I used a debit card at all of these places, and I always checked before going out to make sure I had the funds available.

I checked my account because I got an email saying I had a notice about my account. I look, and suddenly, I'm $49.94 in the hole! I called the credit union about it, and they're claiming I had $2.55 in my account when the transaction for BK went through. However, I checked my statement multiple times and it says plain as day that I had $12.05 in my account at that point in time.

I keep redoing the math on my transactions and I never overcharged. I haven't used my card since Friday, either. I have an account that doesn't require a minimum balance and don't have to pay a fee for a checking account. Can anyone help explain this to me?
<bot>: My credit union is claiming I overcharged when I clearly didn't, and now they want me to pay $50 in fees. Help!