I am waiting for information from Amex as to why they have done what they did, and may take further action based on that information. Amex are on shaky ground with this promotion due to the way it was set up, the allowed base of opt-in members, the lack of T&C's, and the way they specially set up mini websites to advertise the promotion.
PS, I do not feel I have abused the spirit of the promotion (but some transactions have been pretty low value), nor have I earnt an excessive number of points. I would be interested to know if anyone else has had points deducted...