Extremely bad service received

We decided to go for a Spur breakfast. When we entered, we were approached by a waiter named Chris - we I asked him if breakfast was still being served as it was 11h19 already and I wasn't sure if breakfast was until 11h00 or 11h30. He said yes, they were still serving breakfast. With this assurance, we followed him to a table. We ordered 2 kiddies sodas & 2 coffees. A few minutes after placing our orders for breakfast, Chris came to say that his manager was giving him a hard time as it was past breakfast time and now wanted to charge us R40 for the R24.95 breakfast. He assured us that he would still charge us the normal price as he had told us that breakfast was still being served. When done, we asked for the bill and wanted to redeem a birthday voucher as well. Chris came back and loudly said that one of the cards were invalid and the other had nothing on it. I asked him twice to leave it as other diners were listening in and I didn't want a scene. We paid and left after asking for a copy of our bill on which he charged for both kids sodas. We have used both kids cards at three other branches successfully & have never had this problem before. They were very unwelcoming to us.