What rules are being broken? The Direct Debit taken will match the notified amount, so doesn't break any Direct Debit rules.
https://www.directdebit.co.uk/Direct...guarantee.aspx
Quote:
The Direct Debit Guarantee applies to all Direct Debits. It protects you in the rare event that there is an error in the payment of your Direct Debit, for instance if a payment is taken on the incorrect date, or the wrong amount is collected. It cannot be used to address contractual disputes between you and the billing organisation
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As mentioned any overpayment from a bill once the cancellation completes is calculated and then refunded.