If a hospital was legally inclined to forgive your debt but still sold it, can I use financial aid through the debt collector?

I’ll be frank, I make less than $19k a year. In August of last year I had my appendix removed. Despite it being emergency surgery that should have been covered by my insurance, the hospital still charged me $1400, an amount I can’t afford to pay when I’m lucky to make $2000 a month. Hospitals have financial aid offices that, when given proof of this lack of income, forgive your debt. I gave this hospital my application in December after my first one was denied for “insufficient documentation” because I didn’t include my bank statements on top of my lease agreement and last 6 months of pay stubs. If the hospital has already sold it, is the debt collector inclined to forgive it under the same rules?
If a hospital was legally inclined to forgive your debt but still sold it, can I use financial aid through the debt collector?
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