Very Disapointed

I am so disappointed in Hyperli and there false advertising. I bought a voucher with for a body spa treatment , it stated that you have to make a booking 24 hours in advance. When I tried to make a booking 48 hours in advance I was advised that all Saturdays are fully booked for the whole month and the voucher is about to expire in 1 week. I am now forced to inconvenience myself and make a booking sometime during the week before the voucher expires, as I did not get any response when requesting for a refund. I feel that this could have been avoided should hyperli advised that I have to book more than 24 hours in advance. I'm never buying anything from them again!