My patented product was copied and sold at a low price. What should we do?

I have encountered a big problem in recent days. Our company's patented product, the new 40-grid composite pigment box, has been receiving customer complaints. It is said that there are similar products on the market and there is malicious competition. At first, we were puzzled, too. We didn't know what was going on. Suddenly there was no order, and even many offline customers didn't come to pick up the goods. It turned out that a competitor of the same trade copied a 24-box pigment box, which had the same internal appearance as our product and the price was one third cheaper than ours. This time, it exploded in our customer base. Originally, many cooperative customers did not place orders. Our business has plummeted. We launched new products developed and designed in the early stage, and watched each other copy them to seize our market. What shall we do? Please give us some advice. Please everyone. We have encountered such a thing. I suggest you take up legal weapons to defend your rights. First of all, you have a patent certificate. You should take your patent and ask an intellectual property lawyer to help you evaluate it. Without this evaluation, it is useless for you to go to court in the future. This is very important. Second, you should notarize the purchase and find a notary office to notarize the purchased products. Third, while collecting evidence, we must explain it to our customers. I don't know whether your patent is a utility model patent or an appearance patent. If it is an appearance patent, please ask an intellectual property lawyer to help you file a rejection. Anyone can apply for a patent for appearance. I suggest you find an intellectual property lawyer to help you evaluate and analyze. Everyone's situation is different. You'd better find a lawyer to help you.