contact Y-Yo 
Y-Yo Australia P/L
PO Box 678
Mt Martha, VIC 3934
Australia
Telephone: +61 3 5974 2137
Email: info@Y-Yo.com.au
Or for a specific department-related query:
sales@Y-Yo.com.au
marketing@Y-Yo.com.au
press@Y-Yo.com.au
hr@Y-Yo.com.au