Alt.Binz will autounpause enough blocks to repair your file if it's able to. You can pretty much guarantee that if the same NZB from 3 sites leads to a corrupted file, then the post is bad (NZBs themselves are almost never at fault in this regard). It's also easy enough to test if Alt.Binz is working as expected by trying another NZB (different post), and delete one of the files from the collection to force it to repair the download ...
Have a look through the wiki if you need to know more about setting up Alt.Binz.