A competitor is threatening me!!! What to do?

Im an Amazon seller for a long time and there is this Amazon competitor who email me where do I get this particular book (at what bookstore) and he wants to check from his list of his customer bookstore if it is there. the seller said he is the only wholesaler of that book and he wants me to buy books from him at a wholesale price, but I dont want to because I already have this bookstore where I get a good discount price. Im buying and selling books legally. He keeps saying to the email "we will report this as a rights violation to Amazon". What is the best thing to do for protection and so Amazon will not suspend my account if he reports about this to Amazon