Internet Expert to catch stalker

Looking for someone to help me catch an online stalker. He is getting access to my router and emails. He is a former employer and has a picture of my drivers lic, social security and banking info. If I change anything he runs unauthorized background checks to find me. Police are no help. He has been doing this for almost 5 years. There is not malware. He gained access while employed. He is the owner of the company and there was not HR.