Recently I published a book entitled 'Just Plain Love', things were fine until a few days ago when I was contacted by a woman who claims that my book infringes on the trademark of her company 'JustPlainLoveBooks'. My publisher is looking into the matter, but has told me that as long as my book is not about her company I am fine (it's not, the book is a romance). Is this right? Do I have cause to worry? She is harassing me almost non-stop and is threatening to 'sue me for every penny I've got'. What do I do?