Charged interest even though I paid on April 18, 2022
Hello, I filed my 2021 taxes last year by April 18, 2022 and made the payment through one of the third-party providers for the IRS, in full. I have receipts of having done this on that day. In October, I received a letter from the IRS saying that I never made that payment. I followed up with a receipt I had from that website. They updated my account, but apparently I still owe interest (even though I paid on time). Is there any recourse, or do I need to pay the interest? Thank you!
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