Overcharging on Electricity

Since i 1st moved in, i moved in a week prior to when i was able to and my electricity was under R300, following month it went up a little to R334.04, Come January Invoice it jumped to R515.70 that is a jump of over R181.66, when everything remains the same no extra appliances. February invoice it jumps again to R662.00, now for the life of me how does it jump that much in 3 months when I am at work, turn off as much lights as possible, switch off the plugs during the day. and the ones i dont need during night and barely cook? If this isnt ***** that please explain to me what is and how it just keeps climbing and climbing. I am a single mom with a daughter. There is no way we can use that much electricity when my uncle pays R100 pre-paid and they are home all day, tv is on all day, and they cook almos every night also thru Trinity property. Does this make sence. They are also 2 adults. It just doesnt add up, and i am not getting any answers from the Realtor. Something needs to be done.