1040-V was the correct form to send with the amount that you owe.
I would pay the amount due electronically as well as cancelling the check that is too high.
Envelopes with checks may not be opened for a long time due to the IRS being behind. Paying electronically should be faster than mailing a check and voucher.
I would not expect them to return any money to you. If that check goes though, it will most likely be applied to 2021 estimated taxes.
