Got underpayment pen I used Turbo tax to file my return. I have filed on 17th and got approved by IRS on the same day 6PM. but amount owe was deducted on 19th from bank.

I used Turbo tax to file my return.  I have filed on 17thApril and got approved by IRS on the same day 6PM. but amount owe was deducted on 19th from bank, so I have got underpayment penality from IRS, I came to know from Turbo tax and I Didnt receive any letter from IRS, what should I do?