Myntra.com — Missing product from the order.

I have ordered T-shirts with order id#120629520216221936201 from myntra.com from which few were delivered on 8 June but 3 t-shirts were missing from the 1 packet as it was tampered. Raised 3 complaints for same packet but received refund only for 1 and they have rejected the remaining 2 claims. I have raised multiple complaints and had multiple discussions with customer care but they are not ready to listen. Please help me to resolve this issue.