My federal tax payment was pulled from my bank account even though I paid over a month ago?

Hi! does anyone have any tips or insight on how to go about handling this? I owed $500 for my federal taxes and I paid that on March 18th directly to the IRS and there is proof of that in my bank statements. just looked at my bank account for something unrelated and i’m overdraft $300 because ANOTHER $500 payment was pulled from my account for my federal taxes. I’m assuming I need to call the IRS to get this figured out, but does anyone know the general timeline on a refund for this? i really can’t manage an out of nowhere $500 bill 😭