Bought a used genuine 380 bluetooth kit of ebay a couple of months ago, has worked beautifully, now however, while the bluetooth connects properly and i can make a call, and i can hear the person i'm talking to clearly, they can't hear me at all! Does anyone have a clue how i can fix this? Or is the kit a dud?

Check the mic have seen a few damaged during install. Mic is a very generic unit