Poor service

I purchased threw the app pre paid electricity R1000 this was ons the 2 November when I woke up the next morning 4 more purchase was made threw the app that I did not approve their was a glitch or something wroung with their app they purchased R3000.00 worth off prepaid with out my approval so I phoned the bank they put me threw to the company that handles the online prepaid side I talk with someone their extremely rude his telling me that I my self must go the the municipal to get refund so I didn't accept that I phoned Discovery again and told them they must sort it out as it is their app that caused all the problems so they said they must put it on despute and they will come back to me 6 working day so I waited no one phoned me so short story short after 2 weeks off struggling with them they told me that they will fix the problem but I must Pay R400 service so so I refused so all I want to say is don't bank with Discovery they don't care about their customers well-being