Would this be worth suing over?

Location: Illinois
I recently went on a vacation. I’m from Illinois, and went to Portland then Seattle. On July 26th I rented a car from Expedia. It was through Hertz.

I paid around $1000 for it and had/have all the rental agreement, receipts, and credit card statements to back this up. Once landing, I went to Hertz to pick up my already paid for car. They said I can’t have it because it’s “ too big of a truck for my age“. Ok.

After making me jump through multiple hoops, they finally were able to substitute my car. In the rental agreement through Expedia, they say to bring my credit card upon pick up.

They took my card and put it in the chip reader. Now, I didn’t think anything of this because I had made it VERY clear that I already paid the full amount for it a month prior through Expedia. They actually charged me around another $1000 for the rental. Again. From moment one of the vacation, I was broke. Once I realized it happened I even went back to the rude front desk and they said “that’ll be refunded”—referring to my ORIGINAL payment I made in July. Ok.

I’ve contacted support from Hertz—no response(I’ll try again soon I guess). I’ve also been in talks with Expedia. They said they will not give me my refund because the amount charged was the correct one, and even said they contacted Hertz and neither company see any issue. So here’s where I ask you all— if the car was roughly $1000 and I paid roughly $1000, then where would a mysterious extra grand come into play and now why would they deny even having my original payment?

I’m in the er right now. I’m not in the mood for this, and my credit card being wrongly maxed out is slowly pushing me towards the edge.

Can I sue them or something? An extra $1000 isn’t a little amount for them to just deny me even paying it.i