The IRS rejected a Deferral for certain Schedule H or SE filers on my 2020 return. I need to speak to Turbo Tax about this.

If you purchased Audit Defense for your 2018 tax return, call TaxResources, Inc. at 877-829-9695, or report your IRS letter on their web site. http://intuit.taxaudit.com/ Do not contact the IRS until you have spoken to TaxResources. They may contact the IRS on your behalf.

If you did not purchase Audit Defense, you can get help with your IRS letter from TurboTax at the following link.

We can help you with your IRS letter

But it's not an audit. They modified my return, and reduced my refund. TurboTax made a calculation error. How do I enforce the 100% calculation accuracy guarantee?

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@jeffery-pope wrote:

But it's not an audit. They modified my return, and reduced my refund. TurboTax made a calculation error. How do I enforce the 100% calculation accuracy guarantee?

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See this TurboTax support FAQ for the Accuracy Guarantee - https://ttlc.intuit.com/community/charges-and-fees/help/what-is-the-turbotax-100-accurate-calculation-guarantee/00/26355

See this TurboTax support FAQ for how to submit a claim - https://ttlc.intuit.com/community/charges-and-fees/help/how-do-i-submit-a-claim-under-the-turbotax-100-accurate-calculation-guarantee-or-100-accurate-expert/00/26065

See this TurboTax support FAQ for documents needed when filing a claim - https://ttlc.intuit.com/community/choosing-a-product/help/what-documents-do-i-need-to-submit-a-claim-under-the-turbotax-100-accurate-calculation-guarantee/00/26004

Pay me now or pay me later.

Either way you have to pay that SE tax in full.