The screenshot says they will try to take the amount from your Nationwide account on March 10th.
If they are unable to take the payment, they will possibly take further action which may (this is what I think and not what I know) include suspending your account so you won't be able to sell.
I think you need to sort this out and ensure you have the funds in your bank account to make the payment.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
