Our celebration was ruined!

As new property owners, we were given R400 in Doppio Zero vouchers by our estate agent to celebrate our new home. We made a booking for 8pm last night. On arrival the waiter at the door looked confused and walked over to the manageress who came to us and in a less than nice tone demanded to know who we booked with. After a confrontation with my husband she quickly shuffled a small table together for us right by the side door and on the edge of a large seating of tourists. We were in the noisiest spot and every 5 minutes a waiter would run out the door with a food delivery. On his return he would stand and stare until someone opened it again. My husband and I and at least 3 other customers got up on separate occasions to let said waiter in. When the restaurant cleared a little and another table became available, we asked to be moved. We were told it was a 4 seater and we couldnt sit there. Not 10 minutes later, another table of two (also upset by the door) got moved to the table we requested. Our waitress got so caught up in the clearing of the big tourist tables that she forgot to bring us our bill. THen when we tried to pay R333 with our R400 voucher we were told no change! ??????