Overpaid my 2020 federal tax

hi there,

 

when i filed my amended tax via turbo tax on april 12th, i entered my direct deposit bank  account information and also put the date of withdrawal as april 14th, 2021. but irs didn't withdraw my tay payment on that day.  the next day, i reviewed my amended tax again and notice the form said for amended 1040x, i need to mail in the paper form together with the check. so , on april 15th, i printed out the 1040x and wrote a check with the amount i owed and sent to IRS.  On april 22nd, my bank account had 2 identical IRS withdrawal of my tax payment, one is from my check and one is from the direct deposit i put on april 12th which i thought it never happened. so now i overpaid my 2020 federal tax, i paid twice the amount i owed. what shall i do now?  i tried to call IRS but no live person picked up the phone, only recorded message.  how can i get the overpayment back or at least apply towards 2021 estimate tax? thanks for your advice!