Flabbergasted Client

I’m a regular customer of Del Fornos in Flora Centre and I ever so often run into som issues but last night the 29th September I had had enough.

I ordered the specials and a pizza which came and I said they should bring a card machine, they came with the machine and whilst the delivery guy was trying to get network he walked off with my card and the machine then comes back to tell me I should input my pin again because it didn’t go through and even gave me the receipts saying the transaction was unsuccessful however after he left I checked my banking app and found that the transaction went off twice , I called and told them this and the lady said they have cashed up and I should come with a bank statement to get my money back.....

After taking a minute to gather exactly what she just told me I ask her “so I need to go to the bank and Get a bank statement for me to get my money back that you guys should clearly be able to see when you cashed up “ all she said was yes mam.

How the actual hell is that supposed to work ? How much more money should I spend to get a statement (paying for) , petrol to go to the bank and to the store (expense) just to get money that they can see on their side is taken twice for 1 order? Will I get compensated for that too?