I Kall — Yet I have not got my replaced mobile phone

It's been a month of replacement of my recently bought I Kall k320 mobile phone. From the day I received that phone it is creating so much trouble. Hanging while incoming and outgoing calls, speaker is not working properly, camera quality is very poor, gets hanged while using. So, I want return it back as I had bought it from Tatacliq website and they were asking me for jobsheet a confirmational letter of this phone but your team denied me for the jobsheet. Then they told me to replace it with new phone of this model only, I agreed with it. But it is more than a month I have not got that replaced mobile phone too. I bought it for study purpose but my whole time is wasted ij this only. As soon as possible please resolve this problem. Please give me my phone soon.