As the title says, my problem is very unique. I have no access to the (now-defunct) computer on which I had my Spotify Premium login stored, and I don't remember the username, password, or email that I used. I have banking/credit card information in order to back this up if necessary.
I am fine with A) deleting that account, cancelling the automatic billing on it, and using this one instead or B) being restored access to that account.
A word back from Spotify staff or a nudge in the right direction from a community member would be wonderful. Thank you!