unfriendly staff, bad service and food presentation at Kauai Virgin Active Cape Gate

I am very disappointed with Kauai at Virgin Active Cape Gate, almost every time before the end of the evening, we buy vouchers from Discovery or Virgin vouchers, to buy a drink or food after we finish gym, when we present the voucher to the cashier, we are are told, sorry they only except credit cards or cash as the discovery or Virgin vouchers can not be accepted at that time, because of power failure (there was no power failure at these times) we have used many other Kauai restaurants around Cape Town and have never experienced this problem, only at Kauai Cape Gate Virgin active, the food quality and presentation is not very good, sometimes bread is smaller than the palm of your hand, some times toasted and not toasted, staff need a refresher course on food presentation, some of the staff have a very unfriendly attitude when dealing with customers, other staff are very professional and friendly, the cappuccino's and smoothies are excellent.