Amazon India — Automatic order cancellation

Address: Mumbai City, Maharashtra, 400049

Website: www.amazon.in

Website took the order and thereafter issued the order no., later cancelled the order saying limit exceeded. they should have basically not allowed to select if limit was exceeded.
I was not informed about the same on my mobile number as i registered with them on mobile.
After contacting them they saying you need to order again and then further steps will be taken to get the product delivered.
How can order be placed if limit is exceeded? and if it is placed then how you can cancel without proper intimidation?