Myntra.com — Didn't received full refund

I have ordered a product from myntra
Worth rs 710 they also have charged 99 rs as shipping charges total 809, after the delivery i returned the product due to low quality of the product
And also the product that i have recieved was different in colour as shown in the platform .
After successfull returning of the product they only transferred the product amount that is 710 they didn't transferred 99 rs I called them and asked for my rest amount now they are saying that we can't transfer shipping charges .

That is totally unfair when i returned the product they should must return the full amount that is taken from me
It is totally unfair they are taking customer money for unfair reasons.

Thankyou team .