Always try to help the client the best you can, no matter what kind of situation it is. Never escalate the situation, never argue back or raise your voice at them. Always try to be understanding. It is okay to always ask for help, so if maybe the customer is still being unreasonable, it's okay to ask someone else for help, ask a higher up for help. But always keep calm, relax, because your mood also reflects the client. So if they see that you're upset or don't want to help them, they'll just stay angry. But if you're calm, relaxed, and still have a smile on your face, chances are they might maybe calm down a little bit, so definitely try that. And then also, it is always okay to ask for help as well.