Why doesn't Dongguan Meiyingsen Environmental Protection Technology Co., Ltd. have a holiday according to the labor law?

There is a lot of business. Dongguan Meiyingsen Environmental Protection Technology Co., Ltd. was established in 2008, which belongs to Meiyingsen Group and is located in Dongguan City, Guangdong Province. It is an enterprise focusing on technology promotion and application services. Because of various businesses, enterprises adopt the system of rest by rotation, but overtime on holidays is paid with double pay.