Terrible customer experience.Bad bad attitude.

I live at a flat in Kwaggasrand.The meter reading for water and sanitation is managed by Constantia Metering. Yesterday morning they came and disconnected their services at the flat that I'm staying. My account was overdue with R800 and on Saturday the 15th of August I transferred R400 into their account. We didn't get the notice stating that we must pay R800 in order to avoid disconnection. And they claim that they did send the notice. So me and my husband went to their offices to pay the balance so that they can reconnect the services and to complain. We received a bad customer service. The staff have a bad attitude and the technician even threatened to beat my husband. They are unfriendly and have a bad attitude towards their clients. And they tend to forget that if it wasn't for us(the clients),they wouldn't have the jobs. They really need the advance customer service training. My job involves customer service but I will never ever treat my clients like that.