Gross Overcharging

I live in a new Balwin development, and I recharged my account with R350 prior to going away for a long weekend; I made sure that all appliances were turned off prior to leaving, except for my fridge (A Defy eco model).

A day after I recharged, I received a "low credit" notification, and upon further investigation, the R350 I had purchased the previous day was already used up... HOW?! I live alone, and there is no possible way that a single fridge could use up R350's worth of electricity in a day.

This has happened multiple times, and I now routinely spend between R1200 - R1700 per month on electricity, which stands in stark contrast to the maybe R600 I used to spend per month on prepaid electricity in my previous flat.

Something is definitely wrong here, and needs to be investigated.