Cancelling appointment 50 minutes before appointme

I made a appointment at Studio M in Durbanville, a week before the appointment date, with a Daddy Deal voucher and also said that I will use this voucher. 50 minutes before the appointment the owner phoned me to say that they cannot help me anymore. Is this how they treat their customers or is this just because of the vouchers? I am starting to wonder if these \suppliers"just use Daddy deals to make quick cash and have no attention to give a service to the ones that have vouchers. How short sighted as I could have become a new loyal customer."""