Trying to close an account

I have contacted RCS on the 27th of October to ask for a settlement for my Builders account. When I received the amount I immediately settled the account, sent the proof of payment to them and asked for a closure letter. No Response for days. After I queried I received one of their stock responses that my email was received and I need to send them my Bank account statements, ID etc which I refused to do as this is confidential info. More emails where sent on a daily basis. They then debited my account again and stated that they cannot close the account as it is in credit and I need to be refunded. Again they asked for copies of all sorts of things which I hesitantly provided to get refunded. Nothing. Days go by with more email sent. I get one two days ago asking for proof of payment for the settlement which I sent on the 27th. I again sent it to these people. Still no answer from them and no refund.<br> <br> Be very careful dealing with this crowd, they are utterly useless. I am not sure how all the big retailers can use them to provide their financial services. Shocking to say the least.