Consumer Redressal

Sir my name is LIYAKET ali i have make order a tablet model name Iball 3g 7345 q800 from Amazon online shopping on date 25/4/15 they have booked my order in total amount 6875 for one tablet i have choose cod payment mode.they reply me that your oder is success fully placed and give me order no.order(Order# 404-8881682-9363527) .Seller name ARX they rply me all this with texts and mails .when i track my order no. It will shows estimated ddelivery date 28/4/15 to30/4/15.but today 28/4/15 they hv canceled my order with out any reason .now they says that you have again book this order .but now price is rs 8240 .sir if they are not able to delivery this item why they were booked my order.sir when i booked my order stock was available.plz sir save me and other people like me from these shopping stalls. Thank you . Regards--LIYAKET ALI