hi actually prometric doesnt sell the vouchers they only conduct the exam if u give them the voucher. u could purchase the voucher from IIHT ,sd road,secundrabad. if i remember it right there contact numbers are 55203521,9346235323,
u need the prometric numbers for registering the exam
prometric phone numbers in hyderabad are 040-23303903 and 040-23308504 address : banjara hills,road no 12,above the SBI branch office.