Myntra.com — refund harassment

Address: E 65/3 dolphin hills, Visakhapatnam, Andhra Pradesh, 530005

When i placed the order they gave me a stipulated time to complete my delivery but now they failed to deliver my product within the time and at per their convenience the reschedule the delivery in another 7 working days..
1 i bought this product to use it during my upcoming vacation commencing 13 th december and since they have reschedule it i no longer need the product.. But unfortunately to harass the customer they are not even allowing me to cancel the order or refund my payment
This is not acceptable as i am facing this delay delivery issue for the second time and hence i wanted to complaint