I made transactions with 8 cards in Raleigh for a total of $160. Unfortunately, I just found out yesterday that the merchant never actually processed my order because "the credit card transactions were declined because of mismatch of address/suspicion of fraud." Thus, the $20 statement credits I saw on my accounts were in fact reversals of the charges rather than promotional credits as I had assumed all along.
I wrote to American Express (SM on my SPG Biz card) to express my frustration that the promotion was not processed correctly due to Amex labeling the transactions as fraudulent. I asked for statement credits of $20 in lieu of the promotion. Customer Service wrote back that they would give me a $20 statement credit.
Now, I would like to request $20 statement credits for all of my cards (including AU on the SPG Biz card). Indeed, this is what I asked for in my original message. Perhaps the agent failed to realize this. Should I write back to this representative to request that, or should I compose a separate message for each card and its own AU? Cahimmayer's experience seems to suggest that it can all be done with one fell swoop, but I don't know how his cards are organized or how his messages were composed.