Have you tried turning it off and back on?

When I was working for one of the big cell phone providers, I was assisting a customer over the phone. She wanted to process a warranty for her non working phone. She was able to verify the account so I asked all of the warranty questions and processed the order. After finishing it, she then informed me she had 3 more to process. This immediately raised red flags in my head and I put her on hold. I let my manager know what was going on and he agreed. He told me to send a security pin to either a phone on the account or the email to have her verify it. Once I took her off hold and let her know, she immediately refused and hung up the call. My TL let everyone else know of the scam and didn't hear any more from that person.