Electricity Jager meter

Hello Peter am so tired with this so called Jager electricity. Before winter I used to buy R600 electricity and used to last me till month end. And now since last month I bought R600 and it got finished on the 15th then I bought another R300 and it only lasted me a week.and now this month I bought R900 telling myself that maybe it will last.now today 15th June it has just finished.I don't use heater and I only put geyser in the morning from 5:00 to 6:45 then we spend the whole day at work. Where on earth would that R900 just finished in those 15 days Am so so angry about this cos I can't stress about electricity every month when I buy thinking its going to last me till I get another money

Somewhere somewhere someone is ripping us off cos it can't be