Life Day Spa Rosebank bad experience

I received a gift voucher from my cousin for an aroma therapy massage at Life Day Spa Rosebank. When I booked the appointment in advance, I said I was redeeming a gift voucher and gave the voucher number. I arrived today for the massage and had a thoroughly enjoyable experience until I went back to reception only to be told that there was a mix up and "that voucher" had already been redeemed by the person who bought it. Why would anyone buy a gift voucher and then use it themselves? The very least Life Day Spa staff could have done was to have told me BEFORE the massage that that voucher had already been redeemed, and given me the choice of paying for the treatment myself, or cancelling the appointment. Instead, finding out only after the treatment, I was forced to pay R790.00, unexpectedly. Instead of feeling pampered and relaxed, I now feel emotionally manipulated, taken advantage of, and abused. It smacks of a ****, or dishonest business practices at the very least. Needless to say I will never return to Life Day Spa.