Poor initial customer service at pick up and drop off

I had a poor experience reserving on-line and then being told when I picked up car that my US corporate credit card couldn't be used due to a technicality on how I reserved the car. In frustration, I took car and was billed for insurance. I returned the car one week and 3 hours after pick up. The manager I spoke to in person, told me that if I had returned the car within one week she could have taken off my insurance charge since, in fact, my credit card DID cover my insurance. I then made multiple complaints on handing to customer service with no help. This was extremely frustrating and I think it is a way for them to make money on insurance coverages. The car itself was fine.