Charged twice

<p>I visited the Pemberton branch in wigan on Friday the 24th of February at 19.00. I ordered meal up to the cost of £14.35 and paid by debit card with a contectless payment. I then asked if I could cancel the order and change to something else. The manager voided the order and I was told the payment was cancelled and that I didn't need to make another contactless transaction, I have been charged £14.35 for the payment which should have been canceled and also the £10.57 for the correct items. I then visited the store yesterday to request a refund, I was told by the manager to bring a paper statement as he didn't seem to believe me even though I showing him the transactions on my online banking app. Can someone please assist? </p>