Receive IRS notice CP21B

I filed my tax return a month ago and scheduled to pay tax due through my bank account. However, I just received notice CP21B from IRS that there's a change in my 1040 form because of recent tax laws, rulings, or regulations. Instead of paying tax due, I'll receive a refund. So what should I do with payment is pending in my bank account now? Do I need to call IRS to get my money back?