Pick n Pray, sorry out of stock 4 days later

Black Friday was just a cone from Pick n Pay, ordered 2 five litres of cooking oil only to get a message 4 days later to say sorry we are out of stock your payment will be reversed,the nerve and the inconvenience of selling me a dud.Could have used that money for other things on black Friday,why would you confirm stock when you don't have any, that's what happens when you become too big for yourself basing on knowing there is little to know consequences to your actions you.Change your name to Pick n Pray