I have been critical of rental car companies on this group in the past but I also report when a rental car company does something right.
I rented from Thrifty for my last Las Vegas trip, 1/19 - 1/23. I got an intermediate vehicle from Thrifty for $100 and change, thanks to autoslash.com. When I picked up the vehicle and signed the paperwork, the price shown was $106 and change. Usually the estimate is off by $0.10 cents or less, which I attribute to rounding. This time it was $6 on a $100 amount and that bothered me. Not so much for the $6 but why should the cost be more than a couple of cents different?
I got a survey from Thrifty, filled it out, mentioned the billing issue and a couple other issues with the car. The local manager wrote back and after a couple of exchanges, he agreed to rent me a full sized car for my next 5 day trip for $10 a day plus fees. My original cost for the 5 day rental was $226. Autoslash got that down to $149. Even with taxes and fees, this new rate should be under $100.
I've been called naïve on this group for writing to companies to complain. I admit, sometimes it does no good at all. Other times, a modest effort results in a substantial gain.
So, replying to a survey sometimes is a waste of time and sometimes does some good. I believe writing to a company to complain about an issue does good even if the company ignores you. You at least know who the company in question views you as a customer and this can be valuable in the future.