KFC App voucher ****

On 27 November 2023 I purchased a voucher worth R220 for my sister on the KFC APP. I may have missed her contact number because she never received the voucher, when I contacted KFC to retrieve the voucher number or receive a refund, the voucher could not be retrieved. I provided KFC Customer Care with all the relevant information requested to prove that I made the purchase, yet they have not responded with a resolution. Even though I may have mistyped the the intended recipient's cell number, sure because my email address was captured correctly I should have received an invoice with the voucher number, why don't I have that invoices? R220 is a lot of money. KFC cannot let this die like nothing happened.