What was the username?
That sucks and can't you chargeback on the payment?
Contact the seller, the seller probably reported it.
You gotta contact Youtube too saying that your account got terminated for no reason. :/
Try this:
Sign in to the GMAIL on gmail.com (The one associated with the YouTube), and if it asks you to verify your phone, do it. Once done, it should be back. If it links you to a disabled page, it's gone.