Voucher redeem.

I have been struggling to get somebody to assist me with my Voucher that I want to redeem, nowhere do they mention how to redeem the voucher on Vodacom... I eventually found Vodacom rewards, but I cant redeem the voucher there as well. I have phoned customer care numerous times and they tell me I should phone a different number or I must go into the branch closest to me and sort it out... the branch cant assist me and then the tells me to phone customer care/ activation to sort it out... I'm still waiting for somebody to phone me back to assist me with my query.... Nobody wants to help me, they always want to transfer me to someone else.... very unprofessional