i'm an author, one day i was on the internet and a company call zazzle pop up, i click to their website to check their products out mainly their t-shirts. while i was looking i discover my book cover was on one of their t-shirt. i call them they said one of their representive that sell on their website put it on their. they have been selling the t-shirts with my book cover on it for 5 mos. good advertisement for me but i did not give promission to use my book cover. my book is copyrighted and i have a trademark. can they use my book cover for prpfit for them. sazzle said they are not respondsible. and they want give no info of their rep. what should i do.