The most difficult customer interaction that I have ever had was working at a call center for a cell phone company. I was helping a customer trying to upgrade his phone, but he was having trouble because his old phone was still under contract. He became extremely angry and began to shout at me. He accused me of being incompetent and of trying to cheat him. I felt like I would lose my temper, but I managed to stay calm and resolve the issue to his satisfaction.
