In this instance it would appear you are wrong unfortunately...
http://www.thisismoney.co.uk/money/c...days-back.html
http://www.empireclaims.co.uk/blog/i...andom-victims/
It would appear that for some reason companies such as Wonga are not regulated so they can pretty much do what they like.
They may not actually be advocating fraud, but by having such slack processes people are taking advantage.
If you don't believe it then read the above links, google it, or read the comments of our colleagues on here. They aren't all making it up.