Amazon Online Shoping - Cancelled the order stating that the price shown on website was incorrect even my order was sucessfu

I have ordered many products on amazon on */**/** and **/**/** out of which * of these products were cancelled namely
*) Foster FK-**** Pro ***W **mm Reversible ***Pcs Impact Driver Drill Machine Kit (**mm Chuck Size, ***W)
*)Cheston CHB-**VS Plastic Air Blower
*)Snoopy Fiber Filled * Piece Pillow Set - **" x **", Antique White.
I was totally disappointed by this.Order for the first two product was placed on */**/** in the lightning deal of amazon.In lightning deal amazon sells the product at discounted price.The order for the third product was placed on **/**/** at the price shown on the website.My order was sucessfully placed and the payment was made.But after one day I receive the refund of the paid amount stating that my order has been cancelled due to incorrect pricing.Not only once this happen all the three times.Then how a customer can know that the amount shown on web is corrector not?By this it proves that the company is making its promotion by showing fake price to its customer.Even on placing the order they are cancelling it.How much time the company will repeat the same thing??For this I am suffering physical as well as mental stress.I want my product at price in which my order was cancelled or the price differenece.