I know exactly how this feels. I can go you a few better. It was back in 2018, in the middle of my recover from that medical crisis.
1. It was my own sister
2. When I blocked her, she started contacting my online friends
3. She created accounts on all my platforms to harass me and anyone who engaged with me, including on Medium.
4. She drafted her equally disturbing friends to come at me as well.
5. When I blocked all those new platform accounts, and social media accounts, she created new ones to come at me — and my friends and contacts who had tried to defend me from her harassment.
6. She even got on my father's account to troll me.
I had to contact every platform and report her harassment. IDK what they did, but she vanished from all of them except Facebook, Instagram, and Twitter. And, she was in FB and Insta jail for a bit. She was suspended, briefly, from Twitter — but they let her back on.
Thankfully, her she's mellowed and backed off. I don't know if it's the meds or if she really did find Jesus this time. Perhaps it was the years as carer for Mother and Father while they were dying.
Maybe it was the promise that I'd report her on the FBI Cyber Crimes website if she kept it up. IDK. But, she hasn't done it again.