My Telegram account was hacked, attacker changed my email and stole my channel ownership — I still have my phone number. What can I do?

My Telegram account was compromised about a week ago. The attacker changed my Telegram login email to an email address I don’t own (@wwchat.org) and gained access to my account. I still have complete control of my original phone number/SIM. I eventually managed to recover access through Telegram’s email-reset process, but Telegram wouldn’t let me terminate the attacker’s sessions because my recovered session was considered newly connected. It told me to wait a few hours. Before I could terminate the sessions, the attacker logged me out again and changed things on the account. They also took over one of my Telegram channels. I discovered that ownership had been transferred to another Telegram account. I am still listed as an administrator, and the ownership transfer appears in the channel’s Recent Actions/Admin Log. Telegram currently shows: **“Email will be reset in 6 days.”** I have contacted Telegram Support multiple times but haven’t received a response. **My main questions:** Can the attacker change/remove my phone number while I still control the SIM? What happens when the 6-day email-reset countdown reaches zero? Is there any legitimate way to recover the channel ownership after an unauthorized transfer? Has anyone successfully recovered a similar account without paying for Telegram Premium? I’m looking for advice from people who have actually dealt with this situation.