A little over a year ago, I purchased a house (cash sale, no mortgage) which had been turned over to Fannie Mae by Citibank.
Because I was moving from another state, I used my parents address (near my new home) as my mailing address for the transaction paperwork.
In Sept of last year, I received and paid in full my property tax bill (about $5k).
This year, Firstsource began caling my parents home, my home and my cell phone regarding an unspecified debt.