[office drama] I fricked up

So I'm at work and I'm about to start working a different schedule than the one I've been on for the past few months. This is all well and good, and I've known about it for several months at this point. As the day of the change approaches I'm talking to my manager about some other stuff and he says "By the way what was your new schedule again? Because what you told me the last time we talked about it doesn't match what's in the system."

Turns out someone fricked up the paperwork and my new schedule in the system is slightly off from what was in the announcement months back. While slightly less convenient, it's barely different from what I was already expecting so I'm thinking okay whatever. I just really really REALLY need my time off requests that I put in forever ago adjusted to match the new schedule.

Apparently this is not a simple ask. I got pulled into chief HR's office at the end of the day and was informed that the issue had been passed all the way up to corporate legal and they were going to offer to honor the schedule I was originally presented with in the announcement "as a gesture of goodwill (please don't sue us)". I declined and made it clear that I reeeeeaaaaallly don't give a shit about the minor schedule adjustment, I just need my PTO moved. Response was "we technically still can't force that through, you'll have to get $other_department to override it for you if you decide to keep the adjusted schedule."

So now the shitty part is that I know exactly who fricked up the paperwork and I'm worried that I've made enemies out of her entire chain of command. And all for nothing, because I still don't have a guarantee that I'll get my time off. I just wanted my fricking PTO fixed.

This is at a fortune 100 megacorp (doebeit at a very low level because I am an unambitious lazy r-slur).