Paid off defaulted loan, D.O.E says otherwise

Hi all, I’m really frustrated with this situation and need help finding a way to speak to somebody about this.

In January of 2025 I was getting harassed about a student loan about to default and I told my provider I just wanted to pay it in full and be done with it. The total was 1000 and some change and I moved some money around and paid it all off with them. Never heard about it again and put it out of my mind. Continued to pay on other student loans the normal monthly amount

This month, my fiancé and I were attempting to buy a home and when our pre qual came back they said I had a student loan I have been in default with for 12 months. It was the same loan from last year I had paid off. Checking bank statements the money came out of my account. I have never received any communications on this loan since paying it off. No Email, no phone call, no anything. I have tried calling the D.O.E numerous times and my call gets dropped due to high call volume. I sent an email but am awaiting response. Does anyone have any experience with something similar? I’m curious if they have made mistakes like this before as it is drastically affecting my credit score