paying for something I could have done by my self.

I phoned JKNV, Their lines were down and I phoned on their cell number, spoke to the lady on the phone I wanted to know if she could tell me why my tenant could not load money on his hand held unit it was just giving an error. She explained I must go to the flat, plug the unit in a plug close to the DB board, switch the power on the DB board off then on and it should set itself. I told her it did not work, she said she would send someone out, I ask what the cost would be? As I did not have money to pay, she asked how long I had the meter but before I could reply she remembered and said it was still under guarantee, there would be no costs to me. I was very happy and agreed that the technician to come out. Now I am billed with an amount of R450.00, the lady changed her story now it is not a manufacturing fault so I must pay. I don't even know why the meter would not work. When the technician arrived they said no I must plug it next to my DB board in the house not in the flat, which they did and switched the electricity off and on and the meter reset itself, in a matter of 15 minutes total and for bad information on the phone I have to pay them R450.00. No Support !