Legal analysis: you can talk to the merchant with the evidence first. If negotiation fails, you can also go to the consumer association for mediation. Specifically, you can defend your rights through the hotline 123 15 or call the police.

Legal basis: Article 39 of the Law of People's Republic of China (PRC) on the Protection of Consumer Rights and Interests. Disputes between consumers and business operators on consumers' rights and interests can be resolved through the following channels:

(a) negotiated settlement with the operator;

(2) Requesting consumers' associations or other mediation organizations established according to law to mediate;

(three) to complain to the relevant administrative departments;

(four) according to the arbitration agreement reached with the operator, submit it to an arbitration institution for arbitration;

(5) bring a lawsuit to the people's court.