1. Find the contact information of the billing unit, which can generally be found on the back of the invoice or on the bulletin board of the restaurant.

2. Contact the billing unit to explain that the invoice has skipped two pages, and provide relevant invoice information, such as billing date and invoice number.

3. The billing company will handle it according to the specific circumstances, and it may be necessary to void, re-invoice or correct the invoice.

4. If the billing unit cannot handle it, it may apply to the tax authorities for correction, and it is necessary to provide supporting materials and relevant application forms.