ebucks voucher lies to cutomers!

Is this a **** or what?? I received a shoe voucher from yesterday and when I tried to redeem it I was giving a system error and today when I try to redeem it's like it was never there. why are you phishing people and using lies whilst at it - is this a legit voucher or a **** from FNB ebucks to it's own customers?? if that's the case the mind boggling question is why tell me i have a voucher and not allow me to redeem it and worst of all no one from your chat consultants is even available to assist!