Dear members,
I can only provide information that I know at this moment.
Our reservation centers in Singapore, US and Europe will be closed on Christmas and New Year's Day. This has been the practice for the past 3 years since I joined the company.
This may also be the reason the OP is not able to contact anyone during the time he/she is trying to call one of our hotlines.
I believe this is practised universally but I can check if the centers in Japan and Guangzhou are closed on these two days as well.
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Thyetus Lee