Volkswagen 2014 Tiguan pairing and "voice dial" with iPhone 5 problem

I just bought a 2014 VW Tiguan. My iPhone 5, running the latest update, will Pair with the car, will load my contacts, but will not function correctly on "voice dial" commands. It only "hears" names in my contacts whose first names begin with "A". It won't "hear" any other names in my contacts! VW dealership has updated the car's software. The car's mic is working correctly, as are all other aspects of the pairing with my iPhone. But it won't "hear" all of the names in my contacts. My salesman's phone will work--eventually--after a brief delay, but eventually was able to work correctly on voice dial. But my phone still won't. Has Apple encountered this? I had the same trouble with a 2014 Passat, so it is not limited to the Tiguan.

Any thoughts? Is it a Bluetooth problem? VW's problem? A setting on my phone that I'm not thinking of?