Ambulance on African time

I phoned ER Ambulance services at 16:00. I gave the information they required. I received the ref number within a minute. Unfortunately the ambulance never came. At 7 someone phoned to inquire if I still need an ambulance. Basically the same happen in 2017. I was llying on the pavement in pain and blood running out of my head. This happen at 16:00 but I came at the hospital at 19:00.