I have been informed by GoDaddy that it was 300 GigaBYTES. I did ask them to verify this. The unique user hits on the site has been exceeding 150 per day for about a month. So, it may be possible. I just can't imagine that it's the business side as our entire site files are only about 10 MB.

If it is 300 GigaBITS then, yes I could easily see the issue.