Myntra - my order is cancelled every time without any valid reason

I created a new account on Mantra in which I placed the first time order in which I applied myntra*** coupon code and placed the order. The order is successfully placed but after sometime a message appears that your order has been canceled and your coupon has also been redeemed, now you cannot use it. I created a new id from the second number and placed the product with the first time coupon code but this order also got canceled due to which my coupons from both the numbers were of no use. The company gives the user a coupon code and cancels the order by placing the order, due to which the customer does not get the benefit of discounting the product. Coupon got wasted by the company by canceling my first order in both my fresh id
The order amount is *** after the coupon is applied without a coupon the product amount is ***
order product- rica milk wax
I talked with the company customer executive and they told me that you cancelled the order but i didn't cancel my order.