How can I recover my iCloud and phone after being hacked?

I was hacked my friend from telegram texted me he asked for help... He asked to log out from my icloud and sign in to his icloud, he said he need to download some photos from his icloud and i decided too help, but that wansn't my friend and i didn't know about it until i did what he asked me for. After i signed in this hacker or group changed pasword from icloud that they gave me and i couldn't log out from this. They blocked my phone and after 5 minutes they texted my telegram that i was hacked and price for unblocking is 300$ i transfered them this money but i dont have other money... They ask me more money... Please help me I have the phone packaging and the phone itself, there is correspondence with the scammer, all the photos how they texted me

[Edited by Moderator]

Original Title: I was hacked and i need help