Designer copyright infringement. What to do?

Question

Copyright

The situation is as follows:
I have an online store on Creative Market where I sell my designs. There are two license types for each product: Standard and Extended. In the first case, the buyer can use my design exclusively for personal purposes (for example, a dude wanted to give his girlfriend a postcard with my print - he cooked it up and presented it, she is happy). In the second, the design can be used for sale as part of some other product (the dude wanted to make a blanket with my print and sell it).
Today I discovered that some of my designs are sold in some Asian online stores, but no one bought them from me under an extended license. Of course, I wrote to them, but something I very much doubt that they will answer me and remove it from sale. And they, of course, have their own copyright and that they are such good fellows who drew and sell everything themselves.
I have several questions:
1. What to do in such cases? Where to write and to whom to complain :) Especially when you don't know in which country the store is registered.
2. Does it make sense to do something? When it comes to the Internet, there are probably not many options besides "wait and hope for the best")
3. Has anyone been in a similar situation, and what did you do?

Answer 1

If I were faced with such a situation, I would act like this:
1. If the store works on one of the large sites, such as aliexpress, I would write to support.
2. In the case of an independent store "somewhere in Asia", I would spit and not bother. Spend more time and energy.
In addition, if your work is copied, this is a sign of their quality :)

Answer 2

Olga, tell me honestly, are you on stock? )