As long as you prove that you bought your things from them, if they don't return the bill to you, you can ask him for it. Because all Liu Fu products have Liu Fu Peugeot on the certificate, you can prove that this thing was really bought in Liu Fu.

Secondly, if you swipe your card, you can definitely print the proof of consumption in the bank, which proves that the money was collected by Lukfook Company.

If you bought it in a shopping mall, you don't need to find their store, just find a shopping mall, which will usually help you solve it.

If you bought it in a store on the street and they insist on not returning it, you can sue them directly at the industrial and commercial office.

If it really doesn't work, just print it out.