When you receive exceptional service, make it known.
Make it known to the business.
Make it known to the person or the people that you dealt with.
Make it known through reviews or social media.
I recently did this with one of the major car rental companies in Australia. This was the first time I had used them. Overall I was really impressed and made it known to them.
Within a couple of days, I was surprised when the Finance Director for the Pacific region reached out to me and thanked me for the feedback.
Simple praise can be so valuable to a business, regardless of their size.