Hardly stock of the family planning injection

They are always out of family planning stock even though I get an appointment date I'm never told not to come because there's no stock of the injection. I waste my time and end up missing my date for the injection. I can't afford to fall pregnant and then end up sitting a other day at a local clinic instead. I don't have the time for this as I am working. The nurse also has this attitude problem towards me because I am young and married. I really hate this bad service as I am paying for it. I tried contacting vangate mall but the phone just keeps on ringing! I have to run around like a mad chicken for an important injection but then end up without it anyway!