Send the message from another email address. I had an issue with email getting caught in a spam filter. I contacted them from another address and they added me to their white-list.
Or you could simply phone them.
Hong Kong Shop
A2, 2/F., Burlington House, 94 Nathan Road, Tsim Sha Tsui, Hong Kong
Phone : (852) 2366 9738, 2366 2634 Fax : (852) 2368 2194
Email: sales @ wwchan.com