Writing a letter of complaint should be based on the principle of truth and truthfully reflect the situation. The complaint letter shall include the following parts:

First, the complainant's name, gender, nationality, occupation, unit (group) name, address and telephone number.

2. The name, mailing address and telephone number of the respondent.

3. The facts and reasons of the complaint.

Fourth, specific compensation requirements.

5. Proof materials related to facts, such as contracts, faxes, vouchers and invoices.