Batik kart - Package delivered with bad faulty product

Placed a good order on Batik Kart. Requested for COD but they said I have to pay **** in advance. I paid the needful and they sent the order which was horribly packed. Upon checking the order two of the kurtis were of a bad quality, bad stitching, mismatched sizes. They charged me *** extra and did not send me the product. It has been ** days now, I haven’t received any exchange from them despite sending them repeated emails and WhatsApp messages. Have called them so many times they do not return calls. Upon a legal threat they refunded my *** after ** days. They said they will exchange my defective pieces but even after selecting the exchange but have not sent anything. They delete Instagram comments if any negative comments are posted. How does one even know who is a fraud? How are you letting such businesses work?