Amazon India — Automatically order cancelled

Address:	380008
Website:	www.amazon.in

I just place order Envent DeeJay Pro 7800W 4.1 Hometheatre but after couple of hour amzon cancel my order then after i call to the amazon customer support center and ask for cancel my order. After long holding my phone they people tell me that they had some pricing error with that product now my concern that these not first time pricing error issue with amazon as per my knowledge these not first time because a year ago i try to place asus laptop at 199 Rs. (i can't purchase that product because it's display error and after talk with customer support center they said same thing that today happen pricing error issue).
so my question that always amazon did these kind of pricing error and cancel the order and said we are sorry for that but these answer not acceptable for me because all time only these answer and sorry answer not all time.
i requested that i want that product on same amount that i placed order because i place order on your requested amount.
Also one more thing please tell your customer representative and sr.representative how to talk with customer because only sorry is not the answer.