Keep in mind hiring an attorney is going to cost money. Is the 7500 just a retainer fee? That doesn't mean that's all it will actually cost you. Beside the cash and fees above and beyond the retainer fee, there are your personal values to consider.

You either trust what you previously said about being satisfied with what he gave and trust that's what's best for supporting who you are as a person.

Or, you get help to pursue getting additional funds and trust that's what's best for supporting who you are as a person.

I have perspectives on both sides of this choice.