poor service

Took my car there for service and everything came back okay but at the time my brakes had a squeaky sound which I told the service advisor about and he said its probably just dust, my brakes are okay and they will last until next service. tell me why 2 months later my brakes still making a sound and when I called them I was told Id have to pay R1058 to check,??. I then get someone else to check and my brakes are on 0%, they finished. How do brakes go from '' lasting another cycle'' to finished in 2 months? was my car even checked? what else can I expect to break down??