Vodacom voucher

During August I was offered a Vodacom package at Homemark. The package included a laptop, a pocket router and a R500 voucher. I only received the laptop and the router but not the voucher. when I called Vodacom to enquire about the voucher I was always redirected or given another number to contact. After contacting the number that I was giving, the person on the receiving end had told me that I got the wrong number as they do not know anything about vouchers. The voucher is still outstanding, How can this be resolved?