urgent query

Sunday i purchased a telkom LTE 10GB and unfortunately misplaced the voucher. i went back to the shop where this voucher was purchased for re-print, and it was issued to me. Now the re-print does not have serial number and pin. the only thing that i see is voucher pin. i went to telko walk-in (galleria in durban) and they did not assist me. called the telkom call center and they also could not assist. now i need to know, who can be in a position to assist me in this regard.