All I can offer is the same thing repeated over and over.
Reporting does help, though from your limited view of the situation you may not see immediate action, behind the scenes reporting helps. It’s not all that is needed.
https://us.forums.blizzard.com/en/wow/t/thank-you-for-your-reports/556126
You don’t need to open a ticket each time, in fact the only ticket you need is based on the right click and report. If your report succeeds in action against an account, you should shortly receive an in game mail thanking you for your report. Those reports go to a team dedicated to helping eliminate these cheaters, and helps free up regular gm staff for answering other issues.