HP India — Replacement of defective hp pavilion 620tx model

I have got a defective piece of pavillion 620.It's camera is more worst than a keypad mobile phone's camera.It is of pavillion series although it's processing is like low ranges lapy. I had brought it on 21st june 2017 and see it's problem on 23rd n i complaint about it to retailer on the same day but he just gave customer care no...I also complaint there on 25th and they just note my complaint...thereafter i call two three times but still no one came to replace it even to check it... now i just want to replace this defected piece ...