Possibly a dumb question

Hi, this is a dumb question, but I have student loan debt and they are threatening to enter my loans into default. However, a couple months ago I tried to access my account (Edfinancial) with my SSN and birthday but it said no account found.

They are threatening to start garnishing my wages and lower my credit score, but would they be able to do so without my SSN? They do have my phone number and email however. Thank you!