Priceline complaint: Didn’t hold my reservation, extremally rude behaviors by rental car provider. Priceline did not support me in resolving problem with car rental company

I rented a car from Priceline for Routes Car rental. I had a horrible experience with the rental car company and Priceline would not assist me. My plane was delayed due to very bad weather. My trip was prepaid. I called the Routes rental office there times and told them I was on the way but would be late due to weather. When I arrived their shuttle took 45 minutes to get there. There was a long line at Routes customer service desk and people were waiting over an hour. When I got to the desk they told me my prepaid reservation had been cancelled due to no show and was nonrefundable. I argued with the rep. He finally said he would give me a credit for the original reservation which he didn’t have to do .but the new car he would give me was $60 more. I had no choice. Then the rental agent refused to give me a car until I gave him a copy of the declarations page from my insurance policy. the people before me didn’t have it so they had to pay the $30 extra per day for the rental car company’s coverage. Then before you get the car you have to sign many forms written in legalese. None of this is listed on the Priceline website when you make your choices. When they brought my different more expensive car they walked all around the car and took movies on the inside and outside. I spent well over an hour getting a car and they were extremely rude and not helpful. Priceline said I had no recourse and the rental company blamed Priceline. I will never use Priceline or Routes car rental again.