wanted to order the special on Thursday for R99 and doors was closed

wanted to order the special on Thursday for R99 and doors was closed, I phoned them the phone was engage the whole time so I drove there when I asked them why are they phones off the hook and the doors are closed one of the employees informed us that they are too busy so they had to close their doors, if it is a special I have never heard that you can just close your doors your are a fast food Franchise, this is unacceptable and very unprofessional