Myntra.com — I have placed an order and after they have cancelled it automatically

Address:	New Delhi, Delhi, 110055
Website:	Myntra

I had placed an order through myntra when they had a sale on 2nd july but aince july 16th i was kept calling and asking to dispatch my order and they were telling i will be dispatched asap but on 17 july thy have cancelled my order and they have given a discount voucher for rupees 400, after i have order one more produch of puma football and i have applied that coupon on it and now i just cheched and found that after 5 days from the order date again they have cancelled my order without letting me know.
Now am gonna file a complaint in courte.
Its a fraud company that they are running.
Before i was told that there are gonna call me back but i never got any call from myntra.