1. Collect evidence: collect evidence related to the purchase of products or services, such as purchase contracts, payment records, product photos, etc. , can help prove their rights and interests.

2. Collect evidence: collect relevant evidence related to the purchase of products or services, such as purchase contracts, payment records, product photos, etc. , can help prove their rights and interests.

3. Alarm handling: If the merchant does not agree to refund or compensation, he can choose to report the case to the local public security organ, provide relevant evidence and cooperate with the police investigation.