Bad service/ Unfair treatment

I am a new tenant at grand central appartments, the water and electricity bought from protea metering, i am surprised when ever I buy electricity the units are way lesser, today I tried buying for R100 just to prove if what I see is true, when I check the sms there is a debt of R50, am calling them they say I am owing, am asking how am I owing because I am still new and am waiting for my first bill to be sent on my email, they are telling me that they already send me the bill, I am telling them that am receiving emails everyday but I never receive email from protea metering since I moved in and I have been waiting for it, now am being surprised when I buy electricity am told that I have a debt, within a month i already have a debt on my account, what is that, the first email regarding their process it was forwarded to me by my agent notifying me that they will be registering me. The next thing am waiting for invoice until now I never receive it. I want my units back because I don’t owe them. How can I have debt in a period of a month, am I paying for someone. I want my units, my email is waiting for their invoice and there is no email from protea metering in my inbox.