This was The Insiders response on Ask The Club:
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The April payment should have debited on the 1st April – but due to a direct-debit processing error, payments were processed a day early. We apologise for any inconvenience this might have caused. For those fans who've incurred charges - we...
if there is a change in the amount to be paid or the payment date, the person receiving the payment (the originator) must notify the customer in advance.
if the originator or the bank/building society makes an error, the customer is guaranteed a full and immediate refund of the amount paid.
Then you are lucky, for me and a lot of people, each month can be a struggle and every penny is virtually budgeted for. So when a dd is taken the day before payday, it does cause me a problem.