I’ve run into the one week thing before. I purchased an album and 3 of the tracks had audible pops in them: on the Mac and on the iPod.

I reported this and they refunded me for the album and told me not to purchase it again for one week as they could only refund any album one time.

I checked back a week later and they told me they had no idea when it would be fixed. A couple years later and they still have no idea and I still have the poppy tracks. :-)