Brand Registery – Does it actually do anything? Help!

Hello, any help would be appreciated as i’m banging my head on a brick wall. Multiple awards if you solve my query I promise!

We currently have a trademark registered within the brand register and my product has 3 sellers on who are selling counterfeit items. As I have this trade mark and access to the brand registery – how do I actually kick them off or cant i?

They are tanking my sales and reviews – Ive emailed the sellers with a cease and desist and no response. Any help with the brand registery would be appreciated.