Help me unshackled the hacker!

so my ex has gotten all of my accounts including Microsoft outlook,(multiple), @gmail.com,(multiple), Xfinity, my main iCloud account and more that are not mine and phone numbers as well. I’ve gone crazy or thought I was. Trying to get one device after another untangled from this nightmare. My kids were able to use their new tablets bc they’d be destroyed by a week if not a day. They would be missing the card or just no software. Anyways now I’m on my third phone trying to pick up the pieces. I haven’t copied anything. I’ve hand changed everything and he still gets my information by morning whatever I had accomplished he has switched back! I have spoken with the companies. They emails they don’t care and aren’t going to shut them off but how can I stop this. I’ve tried brand new everything! Please help me.