Here are electronic ways to contact FIFA sponsors. Some of the locations are defaulted to Canada as that is where I am. All of the websites for the sponsors also provide address and phone numbers where they can be reached.
Here is the link to FIFA's sponsor page.
I looked at the sponsors of the organisation rather than the sponsors specific to the World Cup. Here are the ways to contact them. Please do contact them as it only through volume that they will hear our message.
Adidas - http://www.adidas-group.com/en/local/contacts/contactus.aspx
Coca Cola on twitter @CocaCola
Hyundai on Twitter @hyundai
Kia Motors on Twitter @Kia_Motors
Emirates on twitter @flyingemirates
Sony on twitter @sony