Oddly enough, I'm pretty impressed with my local waste hauling company. I was getting overcharged for the size of garbage can I had for a number of years without me noticing after containers had been switched out to different types. I placed a single call to my utility company, and they told me they'd have to contact city hall, who manages the city-wide contract and billing. "Great, I'll never see that money", I thought, with quotes about "fighting city hall" coming to mind. A few weeks later, I see a full refund in my online account for the overcharged amount. The employee had followed through and taken care of things for me with just that single phone call. WTF? Excellent customer service from a utility? Mind blown.
In general, I rarely complain when mistakes are made. After all, we all make mistakes. What really counts to me is how those mistakes are dealt with. I think I might write a letter thanking their customer service department. It's probably a rare enough occurrence in an otherwise relatively thankless job, so it would be nice to know that their efforts are actually appreciated.
So yeah, thumbs up for my local waste disposal utility.