Service and information

I bought a combination bedroom/lounge set a week ago. I was told that they did not have stock of some items and so would only be able to deliver on Friday, which they did. The pedestals did not fit well in my room and I called them today to cancel the combination and was only at this stage informed of the 30% penalty fee which would be imposed on me. At no stage during the sales discussion or at purchase stage was I informed of this fee nor was it included on my invoice for payment etc. I now have to return the pedestals as they obviously cannot be used for it's intended purpose and although I have been told that I may replace it with another item of furniture, it is an item I did not want/need. Had I been informed of the penalty fee (which in my view is excessive) I probably would not have purchased the items at all. This should have been communicated to me and I am unhappy that it has not.