Faulty ATM not giving money, but deducts from account

I've been trying to get my R300 back for more than 3 months now. I drew money at a Capitec ATM in Selcourt Spar. I selected R400 and only got 2 R50 notes. The manager at Spar was standing next to me when this happened. I showed him my phone with the sms that said I drew R400 and I showed him the 2 R50 I got. He phoned Capitec and they advised that I must phone myself the next day as it was a weekend. I phoned and when I followed up a couple of weeks later, they said I never phoned and reported the fault. I reported it again and was later told that there wasn't a fault with the ATM. I phoned again to say that there was a fault and never heard from them again. I am closing my account if I do not get my money back by tomorrow.