Rolling forward of transactions charging incorrect amount

<p>On the 27th of March I made a foreign payments and was charged the spot rate at that date and received a sms confirming the amount from standard bank.</p> <p> </p> <p>When I review my statement the transaction was roll forward to the 3rd if April and was charged at the rate.</p> <p> </p> <p>This unacceptable as I made the payment on the 27th of March now being charged more</p>