I have a Sony MEX-BT270, in my car and not so long ago i had to take it apart to get a cd out of it as at this point it wasn't in the car and i had left a disc in it that i needed. After putting the head unit cage back together and finally getting to put it in my new car the bluetooth phoning function no longer works, as in i can get connected through my phone it's just that the other person cannot hear me talking through the microphone. However when taking apart the unit, i didn't tug on the mic cable or anything like that and i replaced it on the pin holder when finished as it was. What could be the problem and how can i get it fixed?