Motorola Mobile EX128
Handset Not wORKING

I HAVE PURCHASE MY HANDSET OF MOTOROLA EX128 ON NOV AND TILL THEN IT NOT WORKING PROPERLY, 80 5 OF TIME TILL PURCHASE MY HAND SET WAS AT THE SERVICE CENTRE, I HAVE MADE VARIOUS COMPLAIN FOR THE CHANGE OF THE MODEL BUT THEY ARE PROVIDING THE SAME MODEL WHICH HAVE THE PROBLEM LIKE SCREEN TOUCH, BATTERY, SIM NOT WORKING ETC ETC.

PLZ SUGGEST WHAT TO DO FURTHER