Review: BlackBerry Torch 9860

Its a sheer wastage of money... Bought this phone in Oct and already have got 3 replacements and they are telling me to go for another replacement. Sometimes when i make a call or receive a call, there is no sound and then i need to remove battery and sim then restart to make it functional. This happens very frequently. Even service center people are unable to help or detect what is the problem. Is anyone listening?? Let me know what has to be done. Replacement is not the only option everytime.