The reason why he couldn't read the novel he bought on his phone was probably because there was a problem with the payment or the chapter he bought was being updated. You can first contact the customer service of the novel website to check the status of the order and ask for the reason. If the order status is normal, you can contact the website customer service to explain the situation and request a refund or reshuffle the purchase. If the purchased chapter is currently being updated, you can wait until the update is complete before reading it. Some novel websites would update chapters for free for a certain period of time. If you still can't watch it after the update is completed, you can contact the website's customer service to arrange a new purchase.