QS Supplies  -  supplied faulty item, but won't replace/refund/repair

We ordered a sink from QS supplies, which came damaged (a corner was bent, so won't sit flush to the worktop), which they refused to replace. QS Supplies won't take any responsibility and had the audacity to try and claim that we damaged the sink! Looking on ebay - there are loads that are bent, so this is a manufacturing problem, (do not buy an Astracast sink!) and certainly something we did not do. They are in breach of the Consumer Rights Act 2015, and still refuse to replace/refund/repair the sink. Looking at previous reviews, this seems to be a common problem with QS Supplies - something I wish I researched into before placing an order with them. Terrible customer service. Will never, ever, buy from QS Supplies again.