Another data point...though I'm not sure what it means. Yesterday (5 days out) I got an email saying my SNA request is pending. So I logged in to check the SNA status and to see which suites were still available and it cancelled my SNA request before I could do anything else. So I submitted another SNA request (for a lesser suite) and it 'took'. Today I got another "We're Working on Your Upgrade Request" email and called as you suggested.I found that getting an agent on the phone gets you a better chance of having the SNA confirmed....
The customer service rep had no idea why it would cancel my previous request and was equally of no help in understanding how to 'rerequest' my original SNA nor the status of my current request beyond reiterating that 'the computer randomly chooses to fulfill SNA requests'. From our what it's worth department there is cash availability for both my original request and my 'new' SNA. I think I'll try again Monday 9-5 in hopes of getting a more clueful CSR.