********** sale on upgrade promotions with no voucher to claim

I was due for an upgrade and upgraded on the 22 of November which was approved and with the upgrade taken up was a R1000 Samsung accessories voucher. Ever since the 29th I cannot claim the voucher. I call and call and nobody can assist me. Either they cancel the upgrade or give me my voucher as this is considered as ********** selling. I want what was sold to me. Vodacom is useless. When I asked to speak to a manager in the after sales department I was told that all the supervisors were in a meeting and non of the managers take calls. What bull is that. The consultant by the name of Phindi was so arrogant and was so rude she kept me holding for 29 minutes.