I will admit we're getting closer. I have received my fourth invoice from Sixt, but we're still not there yet. I guess since we started $4,000 off, to be within $200 is good progress.

They have removed the additional coverage that was added.
They have adjusted the rental rate back down to what was on the contract (no explanation as to why they charged me almost double).
They have lowered the amount of the mileage charge, but are still charging me roughly triple what it should be.

My credit card statement is now a mess. It really shouldn't be this complicated.

Trust me, I do appreciate your help though. I'm not sure I would have gotten anywhere on my own.