Hand up and call again the answer with United a lot of times. I was waitlisted with my wife on miles to upgrade for our anniversary trip to Vegas. I week out with 2 seats left, I wanted to buy up and cxl the miles since I knew it wouldn't clear. One agent from somewhere overseas took nearly 10 mins and multiple pick ups to tell me it would be over $1,000 to upgrade. I called again and got an agent in Texas and said it was $249 so......