At 25, I was in the audience of my first professional speaker, Bob Bales. His presentation got my attention. I had never seen anyone having so much fun 'at work' and getting paid for it!
Statistics suggest that when customers complain, business owners and managers ought to get excited about it. The complaining customer represents a huge opportunity for more business.
I took up an offer for me to lose 30 pounds in 30 days. It worked. I lost 30 days!
I'm constantly amazed that owners and managers of all businesses don't train their people to call the person who pays by credit card by name. It definitely makes the customer feel good and will be a factor in bringing them back to your place of business.