The client does not want to hear reasonable arguments and wants an effect that will not suit them at all. For example, she wants too long and thick eyelashes, but you, as a fan of naturalness, just do not have such lashes in stock.
Not everyone can adequately perceive their appearance, therefore, if the client already has created an image in their mind, it will be very difficult to convince them.
If you know for sure that the result will be bad, explain it politely, give the reasons for your point of view, give examples of unsuccessful experience, tell about the principles of the Golden Ratio and harmony. The ideal conclusion of this situation is to convince the client to trust you as a professional.
- Forgot the wallet at home
After the procedure, the client suddenly says that she has forgotten her money at home. Perhaps, you really met the type of person who constantly forgets keys, money and other important things. But there is also a probability that she will stop answering calls as soon as she leaves you.
First, don't show your irritation and offer to make an online money transfer, if the client or someone from her relatives does not have such opportunity, ask her to write a receipt for the amount of the service provided. So the chance to get payment increases, it will be more difficult for the client to disappear, although the legal effect of the receipt does not bear. And to protect yourself from such situations, you can casually ask the client about payment method or need for change before starting the procedure if you're not sure in your client.
You've done your job well and your client leaves you happy. The next day she calls you, whines, and says that her eyes hurt, tingle, become itchy and lashes even fall off with brows as well. And she is sure that you're to blame. There are 2 options of what you can do - you either start a war, tolerate all her calls, insults and threats or give the money back.