Trezor is open-source and open hardware so technically anyone is allowed to make a clone, as long as they don’t infringe on Trezor trademarks.
Dorj is using a different name and different branding, so they should be good on that front, in theory…
…buuut…
There is no cooperation between Trezor and Dorj. If Dorj is claiming that they are verified by Trezor, there could be a problem.
Could you post here what Dorj is actually saying and where? If you don’t want to post in a public forum, you may also open a ticket via Support | Trezor Knowledge Base and link to this forum post.