Threatening and aggressive behavior of Municipal worker

During 2019 I received a Electricity bill of almost R46 000. I visited the Offices and requested them to investigate the account. They said I should pay the average of what I normally pay, they will audit and come back to me. One month later I went back and ask the same question. The said to me I need ask them in writing to do the audit. I did so. 2 weeks later I went back again and they said to me it was a billing problem from their side. They credited only R6000 and the rest I should make an arrangement to pay off. I could see this was going nowhere although the billing problem was created by themselves. At 1st they said I should 50% of the outstanding amount. I couldn't and eventually made an agreement and since then paid every month as usual. Yesterday a very rude and aggressive individual working for them arrived at our house and switched the electricity off not supplying any paperwork. When my Wife ask him why he shouted and scream at her in public shouting we owe them R22 000 and we must go and sort it out at the Office. This threatening and aggressive behavior is not acceptable