2 years ago when I booked 2 rooms for a 4day/4 night room only ressie over the phone with WDW (it was a spring break discount code), I realized several days later I meant to book 5 nights so I called back and tried to add an extra night and they were booked (this was ASMo) and they coudn't do anything for me. So, I get online and check their website and sure enough it took me all through until it came to the "book this offer" screen. I would have done it except it was not at the discount. So I called back and they still told me they were fulll, I explained how I got to the booking point online-the CM was the rudest man I had ever talked to- he said (and I will never forget it)" I don't care what you see on the computer, I'm telling you ASMo is full that night. You can try booking it online, but it will just be kicked right back out of our system because the resort is full". So I hung up, called again and was able to book that extra night for 2 rooms wiht no trouble at all! Didn't get the discount rate, but at this point I didn't care because I was mad!