When you use iTunes Match automatic downloads on a device, or redownload an account's past purchases, then you risk tying that device (or computer) to that account for 90 days (I believe that it's an attempt to stop people sharing content) : http://support.apple.com/kb/HT4627
If you can't wait for the 90 days to complete then you can try contacting iTunes Support and see if they can remove the association : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page
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