Has anyone had a problem with the iphone5 interfacing with Mercedes Benz bluetooth?

I have a 2012 GLK350 and the I phone 5 connects and works well but it will not download the addressbook defeating the purpose of bluetooth. Have you heard of any fixes ??? I can verbally enter number but must search for it !!

I have the iphone5 and 2012 GLK350. While my car can't connect with my iphone. Do you know why? How could your car find your iphone? thanks!

PHONE CONNECTS AND WORKS BUT WILL STILL NOT DOWNLOAD CONTACTS !!!