Where did these legal fees come from?

Hello, good evening guys. I am writing in concern about legal fees i accumulated while being late on mortgage payments. I sent 2 months payment & 1 day later got served with a letter stating if i do not catch up im out. It also stated it might be possible i would get charged $500.00 in attorney fees. I asked the woman who i'm paying contract for deed to send a copy of what i owe. And the letter stated "Legal Fees…$3,000." I don't understand where this came from.

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