American Express Spam Texting

From the Consumerist:

Several readers have pointed out that American Express has made some changes to its contract "in response to the challenging environment" — the most offensive of which seems to be a new clause that gives them the right to call — or text message — any phone you use to contact them including cellphones, for the purposes of offering you American Express products and services.

Reader San says that there's no opt-out information anywhere in the 4 pages of changes Amex mailed to her.