A Florida teacher thought she’d settled her student loan debt 20 years ago. Then she got a bill for $1 million.

Michelle’s daughter posted the letter to Reddit — a site that Michelle said she had visited “maybe twice” in her life before — in a section dedicated to discussions about student loans. The site’s users quickly tagged one member — Betsy Mayotte, the president and founder of an organization called The Institute of Student Loan Advisors, which provides a range of free services to borrowers like Michelle.

Mayotte is a regular in the site’s r/StudentLoans subreddit, where people share personal experiences and tips as they navigate daunting repayment schedules amid changing debt relief policies under the Biden Administration, and frequently uses it to connect with people who need advice about their loans. In a comment on the original post from Michelle’s daughter, another user calls Mayotte the “GOAT,” which stands for greatest of all time.