Want to cancel order after - price increase on the smaller version of TV

After placing an order online, pay. Message received order is received and tv license is validated. Email for confirmation for delivery and email the order will be delivered by Thursday. Email received the stock is not available. The small same version is advertise with a higher price. It was false adverti*****t and want to cancel the order. According to consumer right the stock needs to be given by price if it is advertise.