Thank you , 175 yuan .   Here you go .   Here is your change and your receipt.Do you have goods unpaid on you , sir   No , I don't think so .   I'm sorry I need to call the security to have a look .   There must be a mistake .   Sorry , sir , it's my job to make sure the goods are paid .   Wait , can you check these sunglasses I bought it in the second floor . I think they forgot to demagnetize it .   Sure . Ah ... That's the problem . Have you paid for it 