First of all, you should collect relevant information, such as the sales volume of the other party, the specific manufacturer, the specific appearance of the infringing products of the other party (buy once), the sales area and other information. Prepare for the future.
If you just want the other party not to sell. And you are sure that what they promised to sell (that is, the pictures displayed online) did infringe your product. You can send a lawyer's letter directly to the other party (seller or sales website), stating that the other party has infringed on your product, asking them to cancel this promised sales behavior immediately, and saying that if you don't take action within a certain period of time, you will sue in court.
If the other party doesn't take action and submit the evidence you collected to China National Intellectual Property Administration for negotiation, you can claim compensation here.
If you are not satisfied with the result, go to court to sue them ~