How to remove competition

I have recently started working at a company who produce headphones and speakers. We sell products to distributors all over the world, and many of these distribibutors sell to resellers, who then list our products. That’s a big problem for keeping our price points!

We have tried many solutions, such as informing Amazon that these resellers are not allowed to list our products, but they really don’t seem to care much.

How is it possible to run a strategy on Amazon which will prevent other sellers to list our products?