Nightmare Online Collection.

I placed my order online yesterday like I always do before with no hassles. I placed 1/4 chicken with a side. It was R53, and it gave me an option to either pay in store or use my debit card. Like always, I chose to pay with my debit card. And I received a confirmation SMS for the completion of my order. I went to the store Nando's jabulani mall about 6:30 p.m. to collect my order, that's when the nightmare begins. I showed the lady the SMS on my phone with the order number and I told her that I have already paid. She checked the order number and came back to me saying that I haven't paid. I insisted that I have paid and I had logged into my banking app to show her that R53 was deducted from my account to Nando's. She asked the lady who was on the counter and she said there is an outstanding amount of R2 that was not paid and I HAVE to pay for it. I was astonished. I asked how is that possible and they said the price has gone up in store not on the app. I told them I don't have any cash on me I only have my card and I was not going to swipe R2 from my card because of the additional banking charges that will occur. She told me there is nothing she can do because she was not the one in charge of the pricing. I asked her to call their head office so that I can speak to them, she reckons that they won't help me either. I asked her to call whoever that I can talk to regarding this issue, she went and called the other gentlemen. I suppose he was the manager. Another disaster. He insisted that I should swipe my card so that I can pay the outstanding balance. I asked if I was the one who was at fault or not. He said no but he is also not responsible for the pricing on the app. I asked if I was the one who supposed to pay for the mistake that was not created by me but by them, ( by them I don't mean him as an individual but the establishment as a whole). He said to me he was going to help me if I came with the right APPROACH. Was I supposed to beg for them to override the price on the till to match that price that I saw and paid? I was puzzled by his statement because I thought saving with a smile was part of their job not mine as a customer. He also said if I was a REGULAR customer, I was supposed to know this. I've been buying using online purchase for the longest time without having any problems except yesterday, you can check my invoices. I spent almost 30 minutes of my time going back and forth about a mere R2. I eventually gave up and I said to him swipe my card but I'll make a review on hello Peter, that's when he said it's fine I can take the order and leave. What was hard to do that on the first place because it was not my fault. If it was R55 by the time I made the purchase online I was going to pay that but it didn't. Online purchase should be efficient. I felt like I was undermined because I was wearing my security uniform. I didn't enjoyed my meal yesterday because of the way they made me feel. My order number was ***. My cellphone number is ***