Myntra.com — cgst and sgst refund on the refund from myntra

My refund no is[protected]. When i have payed for the trouser, i paid 944 inclusive of tax. Due to size difference i had to return the product. And i have recived a message saying that i will be getting refund of 711 in few days? What about the remaining 233.
Accounting to the sgst and cgst act, the tax paid should be refunded if the product is returned. So why am i not getting the refund of the tax when i haven’t consumed the product.