I did wrong...

I'm sorry it's long. And I don't know if I'm posting in the right place but since friendships are relationships too, I guess it's okay. 
I did something wrong. For years I've never been included in friendships or groups and was insanely down and depressed. Then I got with an online group chat and I really felt like I belonged. 
When they started to gossip about other members, I should have walked away or ignored it, but I didn't. I'm ashamed to say I wanted to be accepted so I joined in 😔
But I wasn't happy with myself, so 3 days ago I blocked the people I gossip with and then messaged those I'd wronged. I admitted what I'd done and apologised. Some forgave me, and for that I'm so grateful. Others blocked me, and that I completely understand. 
But now I have a bigger problem. The people I gossiped with are angry that I've opened up, and they're now spreading rumours about me. They've also given my mobile number out and I'm getting extremely vile messages sent to my phone. They're adding to what I've already said and making me looking even worse than I am with untrue things. 
They know I have anxiety but they won't stop, and I'm now scared that if I change my number, they'll start sending nasty letters as they know my address. 
I know I did wrong but all I wanted was to admit my part in it all and make it right again, I never bullied anyone I simply gossiped. 
I honestly don't know what to do.