Help me escape a hacker

So this is a long story and has parts I can't say because I don't know if its still an open investigation or not. I was a victim of domestic abuse from March 1st to June 11th 2019. I was one of the lucky ones to get away. I let it go without a restraining order till I got texts on my 21st birthday of harrassment. The order was finalized in September 2019. The person whom it is against has hacked my everything I own no matter how much protection I had and destroyed one of my computers. He is using a computer he gained when I ran from the abuse. My isp is Xfinity and their modems are absolutely unsecured and today was the last straw I could handle before asking for help. Hr joined a pier to peir game with my boyfriend and got me ip. Within seconds my modem was resetting itself. My family got locked out of and our wifi name was changed to the fun things we had to profanity within minutes. We can not change it and with this being our 40th modem, and this is not an exaggeration, as well as a complete account change. Nothing has helped and the police won't help. I am severely immunocompromised so my only way of doing anything is using the internet. I can't even contact my parents at this point. I replaced a motherboard, cpu, and ram this month from ones that have been destroyed from this and have no extra for the modem to secure my information.  The modem doesn't work without 2 parts and costs a total of 355.42 i put it to 370 due to the cost of withdrawing from gofundme. Yes they charge like 15$. These are the only ones that support my speeds and I would not be doing this if I wasn't desperate please any help is amazing.
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