I saw in a "my production has stalled" thread on the 3/4 series forums about someone that emailed the factory directly and got a representative to physically check on their build and respond. Might have more luck going straight to the source. The address is
info.leipzig@bmw-besucherwesen.de
And their phone is +49 341 4450, you'll should be able to get someone who speaks English.
Also, a direct call to Jacob Harb, Manager of BMW i, seems to have sped up the response I got. 201-307-4407