Debonaires are *******

Debonaires pizza are *******, today I tried to order online and use a R50 voucher provided by ABSA bank, towards the checkout the Debonaires site goes offline is says an error had occurred and when I try to re order and use the voucher it says voucher has expired, if I didnt use the voucher how the hell did it expire if it was accepted the first time. This has happened to me on 2 other occasions where the site goes offline and the voucher gets lost. To me this is theft because I have paid for something and never recieved it. I also urge absa bank no to list debonaires for voucher redemption. Totally disgusted I should be suing them.