Pathetic service

Pathetic service received from Pick n Pay Riverpark Kuils River. I paid for my groceries at the till, when putting in my pin number to pay the machines automatically switched off and rebooted. I then showed the cashier the payment is reflecting on my statement, however she insisted that I pay again and that the transaction would be reversed. I checked my statement and there has been no reversal done within 24hours, I proceeded to Pick N Pay for my refund, however for 3 consecutive days there was no manager on duty to assist,staff kept turning me away. I eventually got hold of the Manager, and was told that there Accounts department is closed over weekends and I should wait for payment on Monday morning- further inconvenience of another 2 days.