I just called the MPC number in Hong Kong, and only had to wait on hold for about 5 minutes.

I got through to a friendly agent who promptly informed me there was nothing he could do to help, because my tickets were booked via the website in the U.S.

When calling the 1-888 number for the e-service center, I get a recording that says they're too busy, to call back later, and a hangup. This has been happening all day. Ugh.