I Have Been Unable To Access My Telegram Account

I have been unable to access my Telegram account for about one week and I need support regarding my phone number. My Telegram account is (or was) linked to the number +251909535***. I sold my previous phone without logging out of Telegram, and now I am trying to log in on a new Android phone. When I enter my phone number to sign in, Telegram shows the following message: “The number +251909535*** is already connected to a Telegram account. Please delete that account before using this number.” Because of this, I cannot log in or reuse my own phone number on Telegram. I request that you help me reuse my phone number on Telegram, either by deleting the old inaccessible account linked to this number or by allowing me to recover access to it securely. I kindly ask you to review this situation and provide a solution as soon as possible.