If so, did you shut down the BitTorrent client after you had downloaded it? BitTorrent clients upload as well as download (seeding), so if you left it running, then everyone else on the internet who was looking for that same file will have downloaded a part of it, and each of those parts is counted in your broadband allowance. So , you may have only downloaded 600Mb (which on a normal speed connection probably only takes about 30 minutes or less) but if you left the torrent seeding, then it is conceivable and likely that you uploaded 1.4 Gb during the rest of the day.
If you didn't torrent it (and simply downloaded it from a website), then ignore the above.
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