Covid jab.

I went for my first Pfizer jab on 20th September. I made my follow-up appointment for the second jab on the date stated on my vaccine card. Duly received my reminder from Clicks the day before the appointment. Got to Clicks (The Zone) at 9am to be told no stock. This has now happened 3x times. Instead of sending a reminder can they rather not advise that they have no stock!! I made the appointments at the Zone because I go for chemo in Orange Grove. The hours are also very difficult...9am to 4pm most people are at work so where can one go over the weekend? I am now way overdue for my next jab. Can someone pse advise where I can have this done in the Meyerton/Alberton area.