In the beauty industry, keeping clients happy is super important, and it's crucial to handle any disappointments with care to maintain their trust. Setting clear expectations before a service is a must. It helps clients know what to realistically expect, especially since results can take time.
With experience we learn to read through the lines when a client has a complaint. Some questions will immediately come to mind. Did I give my client what she asked for? Are there signs of body dysphoria which is leading to the client seeing faults that are not there? Does the client have buyers remorse where they regret spending money for your high end services? Are they scammers that have a history of asking for their money back? In cases where the client is not happy with some aspect of the service, a modification is generally enough to meet their needs. I usually do this at no cost to show good will. In all the other cases, you need to quickly evaluate if it's worth returning the money and banning them from your practice or not. Clients will often threaten you with a bad review as a form of leverage. Bad reviews are not always a bad thing because you get a chance to answer them and show your competence in that way. The thing to remember is that you will never be able to make everyone 100% happy.