Kfc katpadi vellore - Regarding the bill

I have visited kfc vellore branch today evening i.e on **:**:**** and have ordered popcorn biryani and tandoori zinger burger. The sales person told the bill was ***/- rs and I gave the money. When I asked for the bill he said he will provide along with the order and when my order came he did not provide the bill instead he said it will be received to my mobile no and when I said I did not received then he call the manager and issued the bill. To my surprise the bill was ***/- ra and then he said there is no change. But what I observed was he neither provided the bill to the previous customers nor the later customers. All the time he was saying complete figures like ***/-rs or ***/- ra even when the bill was ***/- rs or ***/-rs.