Don't buy Shoprite vouchers - they wont help you if you have problems

I purchased a Shoprite voucher (to send to someone in desperate need) on 16 January, but never received it - despite the money being taken off my credit card. Computicket website was giving errors and then retuned to the home page, without issuing the voucher but the charge still went through on my card. It took 3 weeks of constant nagging to get a response out of Computicket (they seem to ignore messages posted via their website and eventually answered when I posted on Facebook. Said they will send me a new voucher - but it arrived without a barcode. They are again ignoring my emails, Facebook messages on online messages. I will never use their Shoprite vouchers again!