So you have to prove to amazon the item they are selling is not the item you have listed. To do this you buy the item photograph and document the differences and submit it to Amazon seller performance (SP) Under item listed against the details page. Include your order ID number the items name Sellers names that are in violation and a Link to sellers store front.
Then open a return under item not as described Amazon policy states the have to accept the return and issue a full refund for the item. If they do not accept the return then you file a Ato Z claim. Stating they did not accept the return or provide the return label.
State in the AtoZ that you are the owner of the brand and it was a text buy required by Amazon SP policy.
Note You cannot leave feedback or a review for this purchase or you will get in trouble.
If they order from you to fill the order there really is nothing you can do.
When you do the test buy
They will leave or no item will ever ship or you will get an empty box.
If you do nothing they will think no one is enforcing the item and one day you will have multiple sellers at 9.99 and free shipping they will bottom the price out and the reviews will destroy the item.
You are the only one responsible for protecting your brand you have to take the steps to prove it to Amazon. They will not do anything without a Test buy,
Right now those sellers are most likely just place holders collecting data on that page seeing how many views Etc