Money not dispensed

I withdrew 900 at CAPITEC ATM using my Sassa card at, Greenstone centre, but the bank didn’t dispense it. I called CAPITEC , they told me that I should contact Sassa they are the ones who should help.don’t have reference number coz I didn’t keep the slip! Can’t CAPITEC just reverse back my money. I’m so angry because I was going to buy son school shoes on that day