Worst Customer Experience

I've had the worst customer experience ever at pick and pay in Hazyview ( Lowveld Mall) blue Haze, kruger road , I went there to redeem an MTN MOMO voucher , a cashier proceeded to assist me and after redeeming the voucher on the system the till froze and the slip did not print .she then advised that the transaction did not go through on her side but on my side it went throught because when she tried to redeem the voucher for the second time , a message poped up that the voucher has already been redeemed at pnp . They performed a quick cash up to see if the cashier will have a variance and only to realize that the cashier balances . I was told that system support has to be contacted and it's now been more than 48 hours and I haven't got my money . I've phoned customer service and they still couldn't assist me with getting my money back , apparently I have to wait until they have sorted out their technical issues with their system support , what an inconvenience. Why do I have to be the one understanding that there was a technical glitch on their side ??