Can't complete registration

I recently logged on, to try to change my password. I suppose that I had never actually completed the final registration, for whatever reason (it was some years ago). I followed the instructions, and the Minecraft server reported that my Minecraft account is already associated with an MCBans account. I continued to try to log in again to the website (having closed Minecraft) only to find final registration instructions again.

I've run this loop about three times now. Any advice? May I have my account deleted to be reinstated? What else may I do to remedy this?

I appreciate your response. Thank you for all you do.