Just wanted to report on my experience in cancelling two LifeMile award itineraries. I called the call center, they verified my basic details and first itinerary booking reference number. I was on hold for about 8 minutes before a LM rep came on. He verified the various ticket details, I went through the automated system and entered my LM phone pin and my credit card info. For the second itinerary, I just had to just verify the card info already in their system, and then re-enter the expiration date and security code. The phone pin was not required again. The miles are already back in my account. I watched as my credit card's automated alerts came in my email, while I was still on the phone. (I have it set up so that I get an email alert of any transaction where the card is not physically present.)

The entire call took exactly 21m12s according to my phone. I called around 10:30 pm US East Coast time. My first time using the call center and automated phone system, and it was painless.