Boult audio - defective piece received

I ordered boult truebuds from amazon. Initially it was working good but later it shows it's true colours. It disconnected on it's own while i'm on call or listening music. If i make a call while putting them, my voice repeats and it makes a distortion noise. And if somehow they don't make any of this, while listening to music, it gives cut frequently. It's very annoying. I placed a replacement order but i didn't received it yet. It's been ** days now,i've placed the replacement order. I've called amazon customer care *times till now and they keep telling me, you'll receive it shortly. I'm pissed off now.