Poor service, change not given

My husband went to kfc this morning and purchased a meal, He gave the cashier a R200 note. Whilst in the store he received a call,so he stepped out to answer, a friend had been through an hijacking. He walked back in the store took the food, keys, and slip and walked out,not realising that he doesn't have the change.Much later on we realised we never get our change of R133.30. I went back to the store,spoke to the manager in charge along with the cashier in question,went through camera footage but for some odd reason could not locate my husband. Manager does not want to give the change that was supposed to be issued.Upon showing the cashier a picture of my husband she then says she never saw him before. This is utter nonsense and something that is not right. I spent more than an hour at the store and received no joy. I'm very disappointed and upset. As a customer I should have been provided with a possible solution on how to get my change not tell me that she hasn't seen him before when we live up the road and always go to the store.I have the tillslip which shows the time he went in which was 11:23 am. I hope to get positive results and my money back. I should be reimbursed.Simone