I also had this happen and I nearly had a panic attack at the thought of all the content that I had lost. Support was no help since it was a free account. Finally, I figured out that if I changed the password for the student account, then I could use the original password and get into my teacher account. It worked! I could not figure out how to get rid of the student account, but by changing the profile information it separated enough from the teacher account so that I could use it as a test student for some of my setups. Just make sure to remember the new password for the student account if this is what you want to do.
I hope this helps, I do remember the panic,
Mary M
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