iphone 7

I have a 2013 A3 with MMI (low?), it is the smaller screen on the display. I have been able to connect my iPhone 7 via bluetooth, no issues there. However, I am unable to connect to the car via an AMI cable, the car is not registering the data connection at all, but it is charging the iPhone...

Most of the time when my iPhone 7 makes the bluetooth connection to MMI, the audio goes off and the MMI indicates that it is connected on a call. The call timer is running but End Call doesn't work. The phone shows no evidence of being in a call. Actually making a call on the phone and then...