Your ISP, not the ESA, sent this notice to you. You should read that notice carefully and decide whether you need to contact your ISP directly.
You should also follow the instructions for searching for and deleting the infringing content referenced in the notice (see FAQ # 1 and # 3, above). If you have a wireless Internet connection, make sure your wireless router is secure (see FAQ # 2, above). Once you have taken both of these steps, contact your ISP.