Faulty Product & refund refused by arrogant staff

I paid over £30 for a pair of Oakley boardshorts that I purchased from Blackleaf in December 2013. After ONE DAY OF WEAR, the shorts began to tear at the seam. All I had done is walk around in the shorts.

I contacted Blackleaf immediately and was asked to send photos. A considerable email exchange has taken place since and Blackleaf are refusing to refund me insisting that I have somehow 'damaged' the shorts. I have not 'damaged' these shorts at all and it is clear from the photos that this is the case. They clearly have not been snagged on anything. The material around the seam is simply not sufficiently strong to cope with any form of activity.

Boardshorts are supposed to be designed to endure surfing. They were the same size as a pair of Billabong shorts that I have owned for 10 years and are still flawless. They are not supposed to begin tearing at the seam after one day of just walking.

Blackleaf might be good at delivering stuff quickly but they clearly evade any form of responsibility when their products develop a fault. As I have pointed out to them, this is illegal, so I am currently taking legal action against this company.

My advice - there are far better alternatives to Blackleaf (e.g. Shore .co.uk), use one of them instead.