Money taken without permission

Their rep came up to me in our shop. I said it sounded interesting but could not afford it right now. She assured me that by giving my details I would not be debited until I have downloaded the app and activated my membership. (I know, it was very stupid of me)

My account was debited today. I very calmly called and explained my situation and they were actually very professional and understanding. Their "Specialist" eventually assisted me in cancelling my policy but when I asked for my money back that's were we hit a very big and ugly bump. I was told I'm not getting it back. After insisting I was then told to get an affidavit and submit it to them for them to consider paying me back. So essentially, they stole my money and now make you do the run around to get it back. This is ********. I'm giving them an opportunity here to resolve this and pay me back. If they still mess me around I will take this up with the ombudsman.