don't know about your promo, but bear in mind that these days, anything's likely w/AMEX:
* stock price keeps tanking, earnings down the toilet.
* endless financial reviews to their customers, all in the name of verifying customer viability, but in fact, pissing off the customer base by the way it's handled.
* WAY overextended in the credit operations, leading to the above items.
Kind of a death spiral, although it's unlikely AMEX will go down the drain, it just seems like they're running the biz that way.
Put all of this in place, I'd be surprised if anyone gets bonus anything through AMEX. Could be CSRs are told to 'refuse first, dispute second' on most types of callins.
Unfortunately, your finding out the hard way about how best to deal with AMEX on deals - save a hardcopy of the web deal, follow up right away, before anyone has time to 'forget', etc, etc, etc.
Lot of time & crap to deal with just to get some bonus points...