HELP...I'VE BEEN BUMPED OUT OF NIKE AIR MAX TRAINERS!!!?

I bought a pair of Nike air max trainers from this website:

http://www.nike-air-max-1.com/

And they sent me the wrong ones!

I found out once I seen the shipping that they came from China, and when I received them, they were a completely different pair, different colours etc than what I ordered!

When I contacted the company, they were very unprofessional and kept saying that they couldn't swap the trainers as it would cost me 60usd (around £30) just for shipping. (I think this was to try and throw me off getting a refund)

I then said that I would send them away and they have just kept saying that they'll refund me 20%.

What are my rights here as a U.K citizen buying from overseas? I bought through my bank and used a debit card, so am not protected by paypal or a credit card and can't reclaim the money back.

Is there any way of exposing this website or reporting it, as the trainers I'm sure, were also fake!