First, take a look at the product's warranty, which should say where the warranty is, the contact information, and the specific time of the warranty. The sales company is only the agent of the product, and is only responsible for sales. Unless there is a clear mention of after-sales maintenance in the sales contract at the beginning of the sale, which is the responsibility of the sales company, generally speaking, it is the manufacturer to carry out lifelong repair and maintenance.
Secondly, you can call the manufacturer to ask for the name and contact number of the current local agent, through its negotiations to solve the quality of the product you buy.
Finally, if the first two do not work, the maintenance department and proposed to get to the Tianjin manufacturer to repair, and you are not willing to go, then, you can only find a similar product in the local maintenance company, and maintenance engineers to discuss the maintenance of some money to forget.