Do people really get upset about this? I hear it every day and have not even considered it would upset anyone

It just like a transaction, but with time. I booked an hour of your time, but used 56 minutes, so you get 4 of them back. Would someone be upset by giving someone 60 cents only to get 4 cents back because the product actually costs 56? No one expects you can buy anything with those 4 cents, but theyre still yours