Is it illegal for the merchant to sell the hotel mineral water to the person in charge and return one yuan? How to complain?

1. Complaints can be made to market supervision administrative law enforcement departments, trade associations, hotlines 123 15, 12345, etc. Based on business commitments and real transaction vouchers and other relevant information.

2. Report complaints to local superiors or local disciplinary committees.

3. You can complain to the consumer association.