Engineers Choice pvt Ltd - defective used product sent

I contacted Engineers Choice Pvt Ltd
#*** Hemkunt Chamber Nehru place New Delhi ****** for Asus X***UA motherboard via India Mart on september **th ****, as the same They sent Non compatabile motherboard , which i had receied on **th september ****, I fount it non compatible with my sysytem Hence i return the same on **/**/**** after having chat with him via Proffesional couriers .Then he told that he has the compatible motherboard with him to which i had to pay ****rs extra. the deal was done and I received Used and Soldered motherboard From Him on *th october **** and i reported the same to him via Whatsapp he said to return and he provides Exchange . i did the same and on *th october via DtDc couriers . he received the same on *th october . he said that i will check and refund you but the next day He said that the cpu is sorted and it is not covered under warranty hence no exchange or return can be given