That's too bad. You can always try calling back. If you get your board repaired, make sure to double check your tail wires. To ensure there's no nick to cause issues on a newly repaired board.
Otherwise, get the new mCPX if you like the mCPX better. Not sure if you originally purchased the nano as a indoor bird. If that was the intention, the BL mCPX may not solve the issue for you.
Of you're in the states, PM me and let me see what options we have. That is, if you care to keep on going with the Nano.