Billing

I went to the cinema to catch a movie. I got there and I swiped my bank card. They said that the transaction did not go through, even though it went off my bank. They said that if there's a problem and that if the transaction hasn't gone through then we will log a call with IT after. I go to her after the movie and she tells me that now she will need my bank statement. Tells me to go to my bank and get a bank statement at my cost to ensure that their transaction goes through. She did not tell me all this information before and she tells me to either get that or pay twice. Yet she's the manager and she failed to inform me of all this inconvenience in the first place. All I came to do was to watch a movie and now I have to go and get bank statements and pay twice for my food. I was utterly shocked by such horrible service. I paid twice and she tells me if I want my money I must bring my bank statement or forget about it. How is a customer treated this way? How is this supposed to be my happy place