Jiomart — Product not Delivering OR not returning the amount Back

I had Placed the Order, They are not Delivering the Product or Not returning Amount.
Every Time, They are telling 48 Hours, After 48 hour also they will tell 48 Hours, Almost 15 days completed after Delivery date.
I told I don't want the Product, Return money back. they are not returning money back.

There is no Proper Response for Costumer care Executive