Reset/Clear iCloud Music

Help!

I'm trying to clear the music from my iTunes match/iCloud. I have followed instructions at:

http://www.wired.co.uk/news/archive/2012-01/12/how-to-reset-itunes-match/page/2

And Apple's instructions:

Delete songs and music videos from your iTunes library with an iTunes Match subscription - Apple Support

I have multiple itunes machines, but I have Match disabled on all but one. I don't have Match running on any iOS or Apple TV device.

I select up to 999 songs.

I then select delete from the Edit menu, and I confirm that I want to remove the songs from iCloud. I'm using a blank iTunes Library; so, there's no local copy to save.

And every time I update iTunes Match, the original song count is back.

Can anyone offer any help? What am I doing wrong?

Thanks,

Jeff