Billed for a cancellation

On the 25th of March I placed an order which I then cancelled on the same day telephonically ,I called again on the same day to confirm the cancellation and was reassured of it. I was also advised to contact my bank to notify them of this. I followed instructions to the latter. The money was finally back in my account after 3 days, I was then happy. On the 2nd of April a debit went through from my account for R1773.00, made by Spree! I only received the notification on the 3rd! A public holiday and every place is closed so nothing can be done. I was livid! Especially after the guarantee that the cancellation was done! Even when I checked the status of the other orders it showed that the mentioned one was indeed cancelled. Can Spree please tell me what happened here and transfer my money back into my account asap. I buy too often at this online store to have this done to me.