How to deal with angry customers

Just tell them to f*** off. That's all.

Or, change your mindset. Try to adopt their worldview. Understand that your customer is upset, and that a problem has to be solved. It doesn't matter if it's your fault or not. It doesn't matter if it's unfair or not. Just leave your ego on the side, and help your customers. They will feel important. A customer with such a feeling is a high LTV customer.

Be humble and acknowledge when you have made a mistake.

" I'm sorry. If I were you, I would be really upset. You're kind enough to not cancel your subscription. Let me change this, and everything will be ok."

Explain why you screwed

" I'm sorry our app is down. We had some database issues. We're fixing them, and I can send you a text as soon as everything is fine. Is that ok ?"

Don't take comments personally, search for advice.

" I'm sorry that you find our customer service is very bad. Could you explain me what you disliked, and what you'd like next time ? It will help us improve our service.