Do you want to say here how you lost your phone, but someone who found it somehow recognized your business model and is deceiving people by selling them your services, which of course they do not deliver? It sounds a bit unbelievable to me, but everything is possible.

These are very serious things, why didn't you immediately delete the old Telegram username from your posts and replace it with a new one (if you have one)? Why did you wait for a scam accusation against you to claim this, why didn't you do it immediately and in that way prevent the potential misuse of your TG account?

As far as I know, with your phone number, you can log in to the TG account registered with it. That way you can fully regain control over it.