Hi,
We've found a bug in JoomSEF causing URLs with .html suffix not being redirected. The redirection works if you use this URL:
www.mediaz.com.sg/online-marketing-servi...e-website-and-design
The problem will be fixed in next version of JoomSEF. In the meantime, you can either set redirects manually in JoomSEF, or you can use some custom rule in your .htaccess file to first redirect all URLs with .html to their equivalent without the suffix, which then will be redirected correctly by JoomSEF.
Thank you for your report and I'm sorry for the inconvenience.
Best regards,
ARTIO Support Team