Ekurhuleni is milking us dry

I always said that Ekurhuleni municipality is a *****. on the 27th of May i purchased R600 electricity and i got 141.90 units, on the 3rd of June I purchased R600 electricity and I got 224.60 units, on the 13th of June I purchased R300 electricity and I got 112.30 units, on the 3rd of June I purchased R600 electricity and I got 224.60 units, on 13th of June I purchased R300 electricity and I got 112.30 units, On the same day 13th of June I purchased R500 electricity and I got 187.20 units, on the 20th of June I purchased R300 electricity and I got 97.30 units and on the 3rd of June I purchased R600 electricity and I got 224.60 units, on the 27th of June I purchased R700 electricity and I got 105.50 units.

I don't understand why this units keep on getting less and less, before when I buy electricity, I knew that for how much money I will get how many units but now it has changed