Missed a call from this phone number, I was unable to answer due to being at work. I then texted them straight away asking who it was and saying I was unable to answer. A few days later when I had free time, I called the number back and explained that I missed a call from them and asked who it was. It was just some random lady saying she never called me, and she didn't know who I was. When she hung up I texted a ? again to get them to reply but they never did.