Penta — Return penta tablet

I have recd a penta tablet model no 704q on 14 / 09 / 2015 with order no[protected]. His camera quality is very poor 8 mp camera as a 2mp camera. Many scratchs in display. Earphone of the one ear is not working properly. So i want to returned this penta tablet. Please lodge a complain and needfull action at the earliest.