I have a legal question regarding products and domain names.

I have a main store selling different items. Then, about two years ago, I opened a showcase website for one of the products i carry. Lets call that "ProductA". It's sold to me by the manufacturer. The domain I have it under is "www.ProductA.com".

Now that the site has gotton popular, manufacturer is accusing me and to shut down the site. They are complaining that I am not the manufacturer to have that domain and also I have their competitors as our banner adds.

Manufacturer was fine with us when we first opened the site, but I dont' have anything in writing. Can he take legal action against us?

Thanks in advance.
Mike