Received an email saying my account has an outstanding balance.
I pay by direct debit from an account that easily has enough to cover this and any other bills (it’s in credit with an unused overdraft there for backup too).

The direct debit is still active and collected fine in all previous months.
my account is showing both that a payment failed, and has been received successfully. It also shows a large outstanding balance and the email threatens to disconnect me.

How do I get ID mobile to rectify this?