IME there is no fix for this, you need a new number. Telegram is more than a bit twitchy about crooks reviving other people's dead accounts as zombies for some reason.

Next time you need to migrate a Telegram account, open Telegram on another device, even just a web browser. Then you can use that device to receive codes for your new device.

And if you delete an account, make sure you mean it because Telegram management is very afraid of zombies...