Missing Shoprite voucher

I bought two R100 Shoprite vouchers to send as a gift. The recipient only received one voucher on her cellphone. My credit card had been debited with R200 though. I queried by sending an email to computicket, received no reply, forwarded again and no reply. I have also contacted the call centre three times at different times but juts eventually get a message to says there is high cal volumes. Today I received an email with Shoprite Money market’s details so I contacted their call centre. and again congested line. So poor customer service from computicket and they are basically passing the buck to Shoprite now. So who issues the virtual voucher to the recipient? This leads me to conclude that someone decided to keep my other voucher.