I too had issues finding the DMC phone number and then once I did find it, you never could get anyone on the phone. I, as I'm sure as well as all of you, did not have my membership number. As a result, you cannot get through to anyone. I finally figured it out, got someone on the phone, and cancelled my membership. Here are the numers:
If you have your membership number call: [protected]
If you do not have your membership number and are calling from the United States, call: [protected]
I hope this helps!!