purchase of electric prepaid

I purchased prepaid electricity via Standerdbank banking app Using my Blue Bean credit card . Tha funds were taken from my account but never recieved the voucher number . I was left in the dark with no electricity for 8 hours and spend more than an hour on a cell phone to query this . Was helped by 4 different people Incl. Thabiso and Montsiwa . Recieved a ref no CID4905 . The cost just to query this costs twice as much as the problem already and still not resolved . LESSON : NEVER USE STANDARD BANK banking app.!