Does the UK have a Better Business Bureau or similar service?

I placed an order from an Internet dance store in the UK. One of my items was not the right thing, and I have tried contacting them several times and they are refusing to answer my questions. I've e-mailed them numerous times and have received no response. Prior to ordering from them, they seemed helpful and very quickly answered my questions. Now that I am not exactly pleased with my order, they seem like they don't want to deal with me. Is there an agency to report poor business practices to like there is in the US?