If you have been getting emailed bills because your Federal refund has been delayed by the IRS, phone TurboTax Support ASAP. If you have a hardship, ask them for a deferment.
If you don't either pay or ask for a deferment, they will ultimately debit your bank account. You need to contact them right away. Once they start the debit process they cannot stop it, and they start it a few days prior to the bank debit.
If the email has a phone number to reach Support, try that first. If it didn't tell you how to reach Support, here's another way to get a phone number:
Hours are 5AM-9PM Pacific (8AM-12 Midnight Eastern), 7 days/week
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
