Is BTT on Changelly BTTNEW or BTTOLD?
You can ask that directly on the support, they have a chat on the bottom right part of the screen. If that doesn't work, they have a helpdesk or submit a ticket asking this question on them.
https://support.changelly.com/en/support/tickets/newBut if I'm on your shoe, I won't use them. They've got a lot of bad experiences from other members in the forum.