Diamond poorly cut, no care for customers

I wish I had read those reviews before ! I bought expensive diamond earrings from Browns. I had a jeweller change the setting once home to turn them into what I had in mind. That’s when I found out that one of the stone was very poorly cut. So I had a appointment with a diamond expert that showed me how different both stones were and explained everything that was wrong with that diamond cut. He estimated those earring half the price I paid. I contacted Browns for them to replace the stone that is very poorly cut but they are now hiding behind the fact that the setting was altered by a jeweller, even though they agreed these were the stones they sold me. They call you « dear » and give you « kind regards » but don’t give a ****. Behind their assurance of quality, there is no customer service and very bad products ! Don’t trust the reassuring appearance of their stores...