A few people have had issues with their mics. All but one that I can remember was able to go to the dealer and get the issue fixed. Some of them needed the mic replaced.
Do you by chance rest your knee on the left of the center console? I do this and it obstructs the mic. If you do that try moving your knee! Sounds goofy, but it helps on our 2013 and im assuming they did not change it from 12 to 13