PAYING FOR NOTHING

Hi i bought a unipin voucher for R30 at sasol and when i put the pin number it did not give me a voucher number for me to get my electricity instead it sent me a message saying my electricity went towards my dept i sent an email to the support @myunipin and the told me i did not get units the units went towards my debt , i do not have any debt i am renting were i am staying and i buy electricity that is enough for me and have never used any debt electricity , now i called prepaid meters and spoke to brendon i am still holding on the call for him because he did not get back to me i am almost out of electricity but yet i bought this stupid unipin what kind of service is this as i am writting this i have been holding for more thn 10 minutes