I Lost Access To My Telegram Account After Losing My Phone

I had a Telegram account with the username @sungsung14**, which I lost access to after my phone was lost on August 18, 2025. Since the phone was lost, I can no longer log in to this account. I previously contacted Telegram support to ask for help, but I was informed that they could not assist me with this issue. My main concern is that someone else might gain access to and use this account without my permission. I kindly request that my Telegram account with the username @sungsung14** be secured so that no one else can use it in any way. I want this account to be completely protected from unauthorized access.