Myntra.com — dispute in refund

Address: 700106

I have ordered 2 shirts from myntra of approx rs3800, but due to fit issues i lodged a return but during return the delivery boy took the us polo shirt along with him and updated wrongly that he has took the louis phillips and processed the refund of rs1800 was processed and now when i am asking to take the louis phillips shirt back so neither they are taking the shirt back and moreover they have declined my request, which type of fraud is going on, they are very unprofessional.