My iPod touch will not let me turn off automatic downloads and match is clogging up everything will downloads that I don't want. Help!

After getting the match program my iPod is trying to download my entire library from the cloud. I have too much music and not enough space so it is constantly running trying to download and I haven't figured out a way to stop the downloads so that I can get what I want. When trying to deselect the automatic downloads it slides back to on. Is there a way to stop this madness? I can't even listen to what music I do have on it.