Usually here the Management is Non Muslims But They write Halal on their Foods As its Written Halal KFC. The staff is Christians or Hindus but Brand KFC itself is written Halal. So what should we do.

You have two things to consider: Firstly you are in an Islamic country and secondly the meat is labeled as Halal. If you are still in doubt then you can write to the company itself, but i do not see the necessity in doing this as they have already put the halal sign on their products.