1. If the restaurant owner refuses to issue an invoice, of course, you can also refuse to pay for the meal. The invoice management law clearly states that the payee of the business should issue an invoice to the payer.

2. Sometimes the restaurant may say that this month's invoice is used up, and the invoice will be issued in a few days. If you think the boss is sincere enough, you can wait a few days to find a restaurant to issue an invoice.

3. Some restaurants may give you a receipt, but they don't give you an invoice. At this time, you can report it to the tax authorities with the receipt.

4. In case of this kind of situation, you can call 12315 to complain to the consumer association to safeguard your legitimate rights and interests.

5. In addition, there are many ways to protect rights. Mayors' hotlines and local governments are reliable channels to protect rights. If things are serious, you can report them to these departments.