computer repair companies in guangzhou china,network repiar companies

I am searching guangzhou computer repair companies ( Guangzhou IT service companies )

Our company has sub office in guangzhou, needs desktop management,server management and network maintenance,computer repair service.

Guangzhou office has around 35 computers and 2 servers. internet connection is 3M fiber connection from China telecom. but network is still running very slowly.

we need a good IT solution for solve this network problem.