They are scavenging the feeds that I host through my own Icecast server, too.
They do it so poorly that they have the same label for all 3 of my feeds, even though it applies to only one. Multiple requests to fix the label resulted in a boiler-plate response that tells me that they are an extremely low overhead outfit who hope to profit by automatically aggregating the feeds of others and presenting them as their own.
Short of authenticating each user I don't see a way to stop them. Although I am not in this hobby to make money so it's no skin off my knee, I just want them to get my listings correct and they can't even do that little bit.
I am not an expert, and I don't know if this would be possible in your case, or even possible at all.
Would it be possible to move your feeds, or change them in a way that their links wont work any longer, while creating an audio file that loops telling anybody who listens that the feed was being rebroadcast without permission?
In the past, I had a problem with a website hotlinking images that were on my server, so I moved them and replaced them with a gigantic picture of Barney the purple dinosaur (8000X8000 pixels).
I dont know if anything similar is possible with audio feeds...