It was possible that Master Yuan's phone wasn't at his side, but Master Pei believed that Master Yuan knew why he called and didn't want to help him.
It was true that the Yuan family heard that Pei Jiangchao was arrested for abducting Dai Xiongyu.
Master Yuan was very mad at Pei Jiangchao's actions. He was helping the Pei family, but then the Pei family caused serious trouble. So Master Yuan was angry and unwilling to help Pei Jiangchao.
Currently the Yuan family was in a mess, so he was exhausted too.
Master Yuan didn't answer Master Pei's call right away, but it was impossible for him to watch them collapse. After all, the Pei family had a close relationship with the Yuan family. The Yuan family even wanted to help the Pei family climb up to a higher status, which proved how important the Pei family was for the Yuan family.
If Master Yuan did nothing, the Pei family might be heart-broken and wouldn't support the Yuan family any longer.