Finally I have received calls and sms from Canon as soon as I placed a call to one of the customer service rep, Ms Lai (thank you!) and an email to the marketing department (Ms Ang, thank you too!).
Thanks to philters for the advice.
I am happy that they did take immediate action as I need the camera urgently for my field work. I'm not sure if their server was down the other day when I sent an email to their helpdesk. They claimed they did not receive my email.
Seriously there is still room to improve at Canon especially on machine repair and customer service. I'm not a photography enthusiast like my sis (who prefers Nikon) but I want an efficient service when my camera break down (as I need it for my job).