The merchant insulted him by SMS. How can he be proved?

Verify the phone number, contact the merchant, etc.

1. Save SMS: Make sure to save or screen-capture related abusive SMS as evidence, which will help to provide evidence if necessary.

2. Verify the phone number: Check the phone number of the SMS source and confirm the contact information with the merchant. Need to compare previously received information, such as merchant communication or order confirmation.

3. Contact the merchant: get in touch with the merchant, communicate and ask questions, explain to the merchant the situation of receiving abusive short messages, and ask for an explanation or apology.