Quality as well as Damaged item sent

Item delivered to me was damaged. Had a crack in the stone. According to internet info, a quartz does not scratch easily, making me question authenticity. Secondly, after I gave them a bad review on TrustPilot . The owner messages me and harassed me over WhatsApp saying I’m a ****. He calls my wife a **** too, yet he came to do the exchange and then a refund. Please tell me, is that not an admission of guilt in and of itself? I would stay faaaaaar away from this place!!!