Online gift cards mess up

I purchased 5 online gift cards for 5 different people with 5 different personal messages. They were all sent via email / sms The one lady went into the Vaal store on 30 November and was told that she cannot use the sms she received with the voucher number, she had to leave the store feeling very embarrassed, I called the customer care number and spoke to a lady by the name of Sharnae, she told me that the voucher number on the sms is valid and that the store should contact the call centre, today “12th December” another one of the recipients tried shopping online with the gift card but got the message “invalid”… I called the customer care centre and spoke to a guy by the name of Keith for over 32 minutes. He said that the vouchers are valid and he will resend the vouchers to these recipients, the biggest mess up was that these people didn’t receive their own gift cards but received other peoples gift cards, with different messages and different amounts. When I had told Keith that there was a mess up he refused to listen to me and said “OH GOD” when I asked for his managers, he put me on hold then said that his managers are in a meeting and If I want I need to call back, this is a huge mess up and I want some feedback