Ha ha, +1!

Just a brief update:

Somewhat predictably, I did not hear back from AMEX RE: credit limit increase within 3 working days. I waited another couple of days and then cancelled my card in writing, requesting a confirmation of the cancellation. I also stated my reasons as to why I was to canceling, hoping it would trigger get some sort of response (possibly apology!). Negative.

Another 4 days later, I received mail from AMEX - an application for credit limit increase!!

As of today, 14 days after AMEX had received my cancellation request, still no written confirmation or call. I just called them now; card has been cancelled, and I can expect a letter within a week. Absolute shocker.