Bata India — for the same product I have to pay 400 inr more

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Online, 380006

I had ordered men's formal shoes on 05.11.2019. I availed the 25percent discount on the shoes worth 1699 inr. Hence after discount it costed me 1375 inr. Due to size issue i had to return the product. And in return i received online credit of the same amount. Now i want to order the same product with correct size. Now i can either avail the discount or the online credit amount. Hence the same product is costing me with more 400 inr. I requested them to transfer my money in my account but they are not doing anything and every time they are beating around the bush and asking me to wait. I have even complained to bata, my complain number is - 1733105.
I have made around 50calls to customer care, their escallation team member - mr. Avadhesh and mr. Bhattacharya is working into the matter but not responded well and have always tried to extend time.
I have almost made 34 calls, but the issue is still unsloved.