The following are the ways to complain about Liu Yan’s ineffective brewing:

1. You can negotiate with the seller and request a return.

2. Keep relevant evidence and go to an appraisal agency for appraisal to see if the product is fake? Is it passing off as genuine and infringing on your legitimate rights and interests?

3. You can obtain a guarantee from the Industrial and Commercial Bureau or directly file a lawsuit with the People's Court. Brewing is pronounced as niàngzào. It means ① making use of fermentation (wine, vinegar, soy sauce, etc.). ② Extended to organize and process some original materials to produce new things.