Sales contract dispute between Wisefund Investment Holding Group Co, Ltd, Kunming Rural Credit Union, Yunnan-based Dadao Industrial Co, Ltd, Yunnan-based Xinfeng Financing Guarantee Co, Ltd, Yunnan-based Public Financing Guarantee Co, Ltd, Yunnan-based Yinyu Financing Guarantee Co, Ltd, Kunming-based Changqing Financing Guarantee Co, Ltd, Shilin-based Yuantong Playground Management Service Co, Ltd and Zhang Hui