I called MPC on the HK number today and got to speak to what sounded like a HK (Maybe Mainland Chinese, but the accent sounded more like Honkie) agent. He was knowledgeable and sounded pretty experienced. Had no issue cancelling my redemption ticket. He also confirmed that while the taxes and fees might take a few weeks to process, the miles should be redeposited within two days. Oh, and I had also no wait either, called around 11:30am HK time. Very refreshing change from some of the other recent calls I have had lately!