Bad Attitude

We went to Spur Fourways Crossing last night 29/05/2015. It was a Friday night and there is a special going that if you eat 300g steak or more you get a Spur steak knife. My husband ordered a 300g steak. When we left the waitress failed to give us our steak knife. We decided to take my parents out for lunch today 30/05/2015. We mentioned to the manager that they still owe us the promotional knife. He said we need to present him with the slip (which we left in the receipt-book). We told him that it is the waitress that failed to give us our item and not our fault. He had such a bad attitude. Please train your staff adequately with the promotions that Spur offers. Why would we want to keep a receipt for food that we cannot go and exchange? Obviously we keep slips for stuff like clothing.