Do not want to take resposponsiblilty

In September 2015 I bought a clutch kit from Parkers Parts Centre made by the above supplier. 1 Day later it was already faulty and was sent back to them. They are refusing to refund claiming that it was because bad driving and fitment fault on their assessment. When I called them they said they don't deal with 3rd party but responded when I sent them an email denying any knowledge of the report mage by Marcell Webber on the assessment but still refusing to refund. My problem is that given all of the above, I bought a different make and to date its still working fine. I have been driving for years and never had a clutch problem and I do VIP driving. The product lasts 1 day and a different 1 last forever but they still don't wanna take responsibility, they don't deal with 3rd party but respond to an email from the 3rd party denying any knowledge of their own report. How does that work?