I received (parent) student loan forgiveness in Aug 2023. I was informed by my servicer, Mohela, & studentaid.gov, that I was due a refund. I have received most of the stated refund, but it's short $500.00. Mohela says the refund comes from the US Treasury (which it has) & studentaid.gov refers my refund questions back to Mohela. I have written to the Treasury, but have gotten no response. Calling any Treasury customer support number is literally a dead end as they all hang up on you because they're busy with other callers.

Do you have any suggestions as to who or where I can go from here to get the rest of my refund?