Disgusted by electricity tariff

Good Afternoon, I bought electricity on 1st July 2019, which I only received 17units for r40 without any free units. I find this very strange as we always monitor our electricity usage to not exceed the 450units a month. We do everything to safe electricity, using a flask if we boiled a kettle water. Putting the geyser off. If we not in one of the rooms at night we don't switch the light on. Now why on earth do we have to pay so a lot of money per unit. Also our house value is less then r400 000. I did call but the waiting period way too long.