Zivame — Refund not issued for 6 months

Hi
I had ordered from zivame and returned the products in their exchange process. Due to their website gltich the returned request was raised for one quantity but I had returned both the quantities that I had bought. When I contacted their customer care, all they say is within 72hours they will let me know if they can refund the amount. Such a big organisation and trying to cheat their customers.