Flipkart — order was cancelled without any reason and didnt get the refund

Address:

Thiruvananthapuram, Kerala

I have ordered a moto g2 16gb on 6th september .cash was paid through net banking from sbt.but after some time it was informed that my order has been cancelled and also the refund i will only get after 8 days.They are taking money from our account within a minute.but for refund takes more than a week.i need my refund immediately.i have also placed orders from amazon, myntra etc.It was my first time in flipkart to place an order.it is the irresponsibility of flipkart towards customers in placing orders.