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There is a way to claim hardship - there are payment plans that are under the 300 - look at this link to help you:
I would show the hardship and any bills for knee replacement, etc. If you can get a Legal Aid attorney to help, that would be good, too. They are no or low cost.
Have someone go with you, too, so they can ask questions, as well.
Bring all of your Schedule C evidence (documents, etc.) with you - if you can, go over it with a local accountant, if possible.