Poor signage

I had a lot of trouble to find a toilet at Toa Payoh bus interchange. One sign pointed the direction to the toilet. After that, there were no more sign. I looked around the whole atrium. No sign of a toilet. I went one level down to the MRT station. No toilet. I asked a sales staff. Dont know. I asked the MRT staff. Take the glass lift one level up and turn right. That's where I came from. Finally, I saw this small sign in an obscure place. Its seems the location of the toilet is not important to the planners. No revenue, right? Welcome to Singapore.