I received a CP23 for an amount due of $30K. However, we paid this back in April. How do I react? Can TurboTax sort this out for me? Thanks - R

Hi - I hope someone can help me with some advice concerning a CP23 form I just received. I received a request for an amount due of $29,800 including penalty and interest of about $1,500 each. However, we paid pretty much this amount ($30K) back in April. We did the return with TurboTax - and the tax I owed in the CP23 equals the number in TurboTax. So I assume I should not owe another 30K. (terrible thought) Hope the community can help or guide me. Can TurboTax sort this out for me? A few questions I would have are: 1/ What is the smartest way of communicating with IRS - I would just call them on Monday? 2/ Should I put something in writing nevertheless? 3/ Did we do something wrong with the payment (see details below)? 4/ Can we get around these penalties? 5/ How do I deal with the Dec 16 date - I don't want to risk any further penalties or get on the tax-not-paid list. But I am not paying 30K that I would then try to get back again. Thanks so much & happy holidays. R CP23 notice Notice date: Nov 23, 2024 It was in my mailbox: Dec 14, 2024 (today, Saturday) Amount due by: Dec 16, 2024 (in 2 days, Monday) Last date to respond: PAYMENT IN APRIL Submitted 04-14-2024 01:15 P.M. Eastern Time (UTC -5:00) Payment Amount: $30,000 Reason for Payment: Extension Payment Type: 4868 (for 1040, 1040A, 1040EZ)