Difficulty in contacting M of Manpower

I login to the MOM website (WP Online) to check for my firm's quota to employ work permit holders. It was quite difficult to understand the mess of information. I had to call the call center. I searched the website of MOM and even tried the "search" field. I could not find it. I know that there is a call center - as I called them before, but I don't understand why MOM made it difficult for the public to reach their call center.

Tan Kin Lian