You appear to be using Live Self-Employed. That product includes live on-demand tax help from a CPA/EA tax pro, and a final review of your return, which they will sign. It also includes continued tax help/advice during the year. Live Self-Employed is 199.99 for a Federal return, and 44.99 for a state return. If you choose to pay the fees out of the Federal refund, there is an additional 39.99 service fee (44.99 for California filers.)
Did you take advantage of your benefit and had a tax expert review your return prior to filing? You get continued tax help with that product, so you can speak to one and discuss your return. This is a user community forum, and no one here can look at your return.
Here's more info on using the Live feature of your product:
FAQ: What is TurboTax Live?
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FAQ: How do I connect with a tax expert in TurboTax Live?
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You may also get some suggestions in this forum, but don't post any personal info here. What type of IRS letter did you get--it should have a CP or LTR number in the right corner. Are they saying you didn't report some income? Check to be sure all your income is reported on the correct line.
Did you purchase the Audit Defense product?