Samsung — worst performance of samsung phone

Address:

Lucknow, Uttar Pradesh

Highly unsatisfactory performance of samsung s duos.
Bought the phone just 15 days back.
*The battery backup is just of 2 hrs.
*the phone gets heated on charging when plugged in, and when I say gets heated I refer to the immense heat produced.
*small applications like subway surf takes 4-5 min to load.
*the screen of the phone becomes blank and does not resumes back till the the phone is switched off and on..
*the charger is very loose, it keeps on connecting and disconnecting every now and then,
I'm damn sure that I am given a defective piece, the service centre ppl are asking to repair it, but am sorry am not ready to use a brand new defective piece, hence I want it to be REPLACED.

-regards