<human>: Can you provide a brief rundown of the text in within 3 sentences?

I work for a small-ish company. It was a "start-up" when I came here 3+ years ago. While I was on vacation, our Paid-Time-Off policy changed. Instead of vacation and sick days, it's all one big lump of "paid time off". They've started allowing people who've been here more than 3 years to earn 3 extra days. so, 15 days off + 3 extra for us old timers.

The trouble is, when I started I already HAD extra time off. It was in my offer letter. When they're all combined into one bucket I should have 20 days, not 18. 

I've been here for years and I love it. It's hard work, long hours, and not huge amounts of pay. I stuck it out through the days of working 12 hours a day in a basement (with the cockroaches), and now that we're finally getting to be "successful" I feel like I'm getting the shaft!

Is there a way to complain about this without seeming petty?? do I just suck it up?
<bot>: The company I literally (ok figuratively) helped from the ground up is screwing me out of vacation days. Is it petty to complain?