They are harrassing me, and trying to contact me t...

They are harrassing me, and trying to contact me to pay back a student loan debt that I paid off in 2012. I contacted the number they gave me and the lady is sending me a letter with the paid in full information. Once I receive that I am going to call them back. Aja was all threatening to garnish my taxes but I don't owe the debt and knew I did not owe the debt.