My filing papers are complete and I have arranged for the tax due to be paid by credit card but I have received notice "You haven't filed yet"

Did you e-file or mail them?

You can double check your efile status here     <a rel="nofollow" target="_blank" href="https://turbotax.intuit.com/tax-tools/efile-status-lookup/">https://turbotax.intuit.com/tax-tools/efile-status-lookup/</a>

Or you might have another account.  That's common to end up with multiple accounts.  First LOG OUT of whatever TurboTax account you're logged into right now. Then use this TurboTax account recovery website to get a list of user ID's for an email address.  Run the tool against any email addresses you may have used     <a rel="nofollow" target="_blank" href="https://myturbotax.intuit.com/account-recovery/">https://myturbotax.intuit.com/account-recovery/</a>

If you e-filed you can check the status here. https://turbotax.intuit.com/tax-tools/efile-status-lookup/