Midcity Property electricity no no no

Midcity Property/ utilities must be honest with their clients because they are not at all.we were experiencing huge amounts of electricity bills then since l stay alone went to them to ask how do you read yr electricity billing because can't be paying 600 to 700 a month whilst m barely home due to work ..not using geyser just the fridge is the only heavy appliance working daily .l asked them to change to prepaid electricity so that l can control it myself not knowing this is going to make it from very bad to worse.since the prepaid meter box have been introduced each and every transaction have deductions e.g R100 you get 11units ...after all their deductions every month whenever you load electricity they deduct R289 ...so how is that prepaid electricity .