first of all, you should make sure that the invoice has their stamp on it. It should be the stamp of Yum! If there is, and you are absolutely sure it is a fake invoice. Hehe, then you have two choices: 1~ call their company. You can knock it hard. If they don't solve the problem, they will call their 811 number to complain (118117131579), and then they will be even worse. 2~ Complain to the local industrial and commercial tax department, and ask the media for help if it is not easy.