Where's the Visa office, is it Qatar Airways ticketing office near toyota towers?

Let me share my experience. A month ago, i applied for a family visa for my brother with my husband's sponsorhip. We went to the immigration office and unfortunately, it was denied twice that's why i need your advice, guys.

Also, shld i ask a letter from my company for added supporting papers? I want him to be here next month.

TLC

Leslie