75 AF posted in Oct and I spent 6k @ 6% in Nov.
Yeah, but you had the unlimited card.
From what I've read, the unlimited card converts to 6K on your anniversary in 2013, and gives you a new 6K for the remainder of the calendar year. Then your 6K restarts again on the first statement that closes in the new year.
So to prove whether I'm right or you're right, we'll have to wait until your statement closes in January, and then continue to wait until your points show up in February's statement. Note, I'm not as positive about the exact statement that the reset happens (whether it's the first January statement close or the first statement that starts in January...I'm inclined to think it's the former, but if it's the latter, then we'd have to wait yet another month to find out for sure) or if it's a particular day during the statement period when the reset happens.