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any help would be appreciated
If you actually paid for this service yourself, I suggest you first talk your former employer into paying you back for whatever it cost you to have the site running (domain, hosting, design, support and maintenance, good-will you've brought the company, etc).
Depending on the outcome of your chat with them, you can give a threat of bringing down the site, but before you actually pull down the site, consult you lawyer.
In any case, I wouldn't advice you pull down the site, even if your former employer proves adamant. This world, my friend, ... you never know what tomorrow will bring you.