The link appears to be working for me, here is the contact information in case you still can't see it.
CUSTOMER EXPERIENCE CENTER
Most answers can be found in our FAQ section, however should you require additional assistance, you can contact your local Mazda Dealer or call our Customer Experience Center at (800) 222-5500. Representatives are available Monday through Friday, 6:00 a.m. to 5:00 p.m. Pacific Time.
The Mazda Customer Experience Center can also be reached by chat, mail and email.
For non-technical inquiries, please contact us on Mazda Chat. If Chat is not available, please call us at (800) 222-5500.