Lies about Voucher

Good day I am very unhappy with the service rendered to me by Vodacom upgrades. I recently upgraded my 2 contracts new phones and new data packages.. I was told that I would get 2 vouchers from Garnish vouchers worth R250 each. First phone I received on the 14th of Feb second phone on the 17th of Feb. First phone was for my hubby he got a voucher that has an expiry date of the 28th Feb 2023. HOW RIDICULOUS!! My Phone came through with the very same voucher still sealed with an expiry date in 3 years time. Now I am sitting with 1 valid voucher and 1 expired voucher. I enquired with Garnish and they advised that is impossible and highly unfair but unfortunately only Vodacom can assist me with a new voucher as they issue these vouchers to Vodacom and Vodacom then issue these vouchers to their vodacom customers. What makes me even more angry is the fact that I was hoping to use this voucher to buy a head for the cable to charge my phone and now that's not possible. As a loyal customer for many many years I am really not happy about this. I am even considering leaving Vodacom.