A FlyerTalk Posting Legend
Join Date: Sep 2012
Location: SFO
Programs: AC SE MM, BA Gold, SQ Silver, Bonvoy Tit LTG, Hyatt Glob, HH Diamond
Posts: 44,353
I had this issue once (though I wasn't told about it).
When I saw the message online, I actually called in, and they told me it was because I was never charged a cancellation fee. I had to dig through credit card records in order to believe it.
But I was able to pay it online, no problem. It just added an extra $90 to the total it charged me.