paid account disconnected

I am meticulous about paying my bill on time every month. For two months now, I have received two bills with two different amounts on them. I have called and they have confirmed which is the correct amount. Yesterday afternoon, two black guys arrive at my gate in a white bakkie with a ladder on the top and he shouts to me, \ Electricity"I told him there was nothing wrong with our electricity. Then he says he's come to disconnect it!! I asked him what he was talking about cause I had paid. Then he wanted to come inside to see proof of payment. He had no municipal ID and was not wearing any municipality clothing"