This is too simple! If you don't return it, you can discuss it directly with the library. If you don't return it, you can go through judicial procedures. Before, a person recharged 50 yuan on HowNet, downloaded one and asked for a refund. People refused to refund. Later, after judicial proceedings, the court finally ruled that HowNet must be refunded. So, as long as you are serious, there is nothing to be afraid of. . The final victory and fairness must belong to you! ! ! !