Jet NO REFUND

On 13 May 2018 I placed an order online,made the payment with my bank card.The internet took me back to the home screen of jet and i did not get an order number.All of my items were still in my shopping cart but the money deducted from my account.I sented them an email to ask for my refund.They asked for proof from my bank that it did deduct.I sendes them the proof from the bank with an bank stamp on it with all my information,my card number,acc number,my name an surname,the date an time the money deducted from my acc.One of Jet's assistants emailed me and told me that the card number is incorrect and that i should go to the bank and ask for proof of my account,although i already provided them with the proof of the bank they still say that my card number is incorrec***** almost 2 month now and NO refund.HELP PLEASE