I learned something today. After waiting six weeks and hearing nothing from Delta, I tried to call; every call was "we are too busy to talk to you", click. But one of the recordings mentioned Facebook so I went to the Delta FB page. Delta reps were telling people to send a private message, so I did. I gave them my Skymiles number and the "case number" and had the miles back in my account within about two hours. I think the recording also mentioned the app but I was so frustrated that I wasn't listening very well.