Spur customer service is terrible!

I went to spur with two cousins... So my cousin asked the waitress if they still have the special, which is the two burgers for R55 (the buy 1 and get 1 free) because we hadn't been to spur in a while and the waitress said yes and we ordered 3 specials (6 burgers) ... we ate 3 burgers and were taking the others home... So we asked for the bill... Only to realize that there was no special... So we called for the manager.... The waitress first said that she didn't hear what we had asked her (then why did she say yes??) and after talking to her so called "manager" she came up with a different story... The customer service was bad and they were rude to us...