It’s a fact of life as a business owner and you need to learn to accept it. You can have the best marketing strategy and offer an amazing product for a great price, but every once in a while you’ll have a customer who isn’t entirely happy.
There are many reasons why a customer is dissatisfied. Maybe there was a delay in their delivery, they could have gotten a faulty product, or they simply had unrealistic expectations. It’s not necessarily your fault but the result is the same and it can be damaging.