I feel that I must offer some criticism. I get the impression that this site is your own. Please correct me if this is false. I have a few points to bring up:

1. I am pretty sure that you cannot force them to pay the $1,500 + in design fees.
2. I am also fairly positive that SSI includes must be placed in file with the .shtml extension.
3. It is possible that they made a change to their server setup, only allowing SSI's to be executed from the CGI directory. You probably should have tried this.
4. Your frustration is understandable, and their continuous contradictory responses are a bit ridiculous, but I think it would have been more beneficial for you to call them. It would have been resolved much faster.
5. From a personal perspective, I find it funny that there is now a GoDaddy bashing site...

This is all based on the story on your index page, I didn't take the time to look at your other horror stories.

But, your review/site can be beneficial to others looking for hosting as it is always good to hear others experiences, but not base a decision on the experience of one client.