Inconsistent bill

I just viewed my bill for March and to my surprise the bill is higher than the previous months R2600 and whats strange is I wasnt even home,how could it be that my bill is higher on the month that I wasnt even home than the other months when i'm home?? Doesnt make sense,I have no doubt that if I ask for justification on this bill I wont get any,i am realy cautious about electricity usage and I have noticed that instead of my bill going down it goes up every month, the other times it was higher than my actual usage but didnt take it up but I see now its getting ridiculous..I stay by myself, wake up at 5:00 put the geyser on and switch it off at 05:40 then go to work, come back at 17:00 switch the tv on, at about 19:00 I switch on the light in the living room, I dont switch on any other rooms unless im in that room but 99% of the time im awake im in the living room,then 20:30 I go to bed so you cannot tell me 2 hour lighting in on room and a tv and 40 minutes geyser usage amounts to over a R1000 each month?? I stay alone and theres no one using electricity when im not there, I hardly ever cook so something here doesnt make sense..not one bit