In short, they're either scammers or many hidden fees. Was only supposed to be charged $213 but once we arrived they "didn't accepted our insurance" so it went from $213 to $500

Well, I had my car insurance and bought extra coverage from Expedia. They were not good enough for Next Car. Stay away from these scammers.

Same here. I told them I had my own coverage. They said they couldn't accept it without my declaration page. I happened to have a copy on my phone. Then excuse was my deductible was too high.

You can always opt out of their insurance, also in order to be covered you either have to have full coverage or have car insurance coverage through your credit card. You can always file a complaint with the BBB regarding their practices