Myntra.com — Price changed

I had ordered a wildcraft t-shirt under order Order ID # 1178493 [protected]
from myntra.com .Its actual price was 575 Rs but i had myntra credit cash of Rs150 .i used that cash while purchasing that product .now the buying price was (after adding myntra cash) 425 Rs .Then i ordered it at sub total price of Rs 425 .But today when i opened my myntra app to chech my product detail it is showing the sub total price 575 Rs but previous day it was showing 425 rs sub total price .Please help me sir they have cheated me #fake myntra