Shocking experience with Seedleme

I am in the in the interiors business and have never had such poor service delivery from my own sector. I ordered two concrete basins from Matt, and even though I did not mind it being unique and "rustic", it arrived chipped and marked - and most importantly once plumbed in, water pooled in the base because it does not drain to the hole due to a faulty mould. I contacted Matt multiple times - he was rude and unhelpful and wanted me to pay for getting it returned and replaced. I asked him multiple times over the course of 6 weeks to replace it - and he refused to assist further, without me having to pay to take it out by plumbers, send it back at my own cost (despite having paid for delivery) . His items were clearly faulty, i had sent him a plumbers report and photos, and still he did not tend to it. He then threatened to write a review on my own business, if I exposed him, despite never having provided a service to him. The second basin , which was my brother's , we asked for a refund, as it was never plumbed in, he never responded, multiple times. I would never recommend Seedleme to anyone. Very poor customer service and their products do not match their images, and also the basins do not drain to the hole. So, 6 months later, I now sit with a sink that pools water in a guest house , and no solution as the kitchen island counters was cut especially for this bespoke sink.