Shady is as shady does! Cotton on stop holding on to my money and then charging me for being in interest!

I am in a large amount of credit with Cotton On. I noticed they are charging me for being in credit. They say this is their policy. I therefor immediately notified them that I would like to close my account. That is where the fun and games began. They asked for every form of ID via email, along with banking details etc etc. I refused based on the fact i had only a few months previously submitted all details to open the account and that I did not want my personal details being sent via email with all the identification etc *****. I also referred them to my private banker to verify anything they may need to. No response. Sent queries via twitter and they have tried to refer me to RCS, where I have had no joy. Another month has passed and still no resolution, yet they will be charging me for holding onto the money they owe me. This is out and out *****. On top of it when I actually tried to buy on the card 3 weeks ago, they have frozen the card as well. This is so not acceptable and I want my money back