Prepaid Electric purchase

I bought prepaid electricity this morning and I didn't get the voucher, I call the number the number that was provided I spoke to the guy who kept me holding for 6minutes until my airtime run out as I was using cell phone, I have to buy another R29 , I called I spoke to Tshepiso Madi who was so rude she said she couldn't help me and she was worse when I was speaking with her she kept quite, until I ask of she was still there, worst part is I have a 11month old daughter that I needed to prepare milk and warm food for her, and standardbank wanted me to spend money that I was supposed to use for my kids bread by buying airtime to call them for their mistake, I'm so frustrated about the service that I got from standardbank, I'm thinking of changing my bank as well.