If you received a letter from the IRS and you have taxes owed then access the TurboTax Audit Support Center.
See this TurboTax support FAQ for the Audit Support Center - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-audit/turbotax-audit-support/L6AcMoNFD_US_en_US?uid=m68i9cj6
We can only help you here if you can explain your issue. To talk to a representative, you will need to log into your TurboTax program where you will see offers for live help.