Double charging and rudeness

Here on Monday the 26th of October 2015, I went to debonairs Braamfontein to purchase some pizza. I opted to swipe for my payment, the attendant thus proceeded to charge me and the transaction went through validly and I received the proof of payment on mobile phone. However the attendant stated that the payment had not gone through and I insisted that it had not however I was rudely dismissed. She proceeded to charge me once again and I was thus dismissed in a rude manner once again. The error would have been resolved amicably however I feel that her attitude was quite disrespectful. I felt that there was no courtesy and care for customers at all.