Can you be more specific? I have never seen the IRS contacting a taxpayer so soon after April 15th that the T/P's tax return has not been filed. What is the letter or notice number? When did TurboTax tell you that your tax return has been "accepted" by the IRS?
Do you have a refund or payment due? If you have a refund, perhaps go to irs.gov and check on your refund status. If the tax return has been filed, then you'll see the refund status. If you have a payment due and you had set up ACH debit, the amount should have been withdrawn from your bank account.
Lots of taxpayers file an extension request. It's highly unlikely that the IRS would contact any taxpayer within ten days of the original due date, presumably demanding a tax return.
