Electricity billing

I live in the Bellville metropolis in a building that houses both private companies (eg Lewis HQ, GP offices etc) and residential. I live in one of the residential units.

All meter boxes in the building was changed around 2013 on instruction by the city of Cape Town (CoCT). After the change I stopped receiving my 50units per month and my rate per KW has skyrocketed. My receipt lists my service provider as Small Power 2. Who is small power 2?

As at the 30 of October 2017, I bought R200 electricity but only got 45KW, how, why? I live in a private residence.

Can someone from CoCT explain to me whats going on? This is absolutely unjust and wrong.