eThekweni Municipality constant billing errors

eThekwini Municipality are the worst bunch. Firstly, they changed my Fathers address to his neighbours address a few years ago so being an elderly person, he did not pay his bill because he did not know what to do or how much to pay. So he fell into arrears. He then paid what he thought but that was not good enough. The municipality do not charge for electricity if you are in arrears, but dont disconnect as there was no access to the meter box which is situated at the neighbour. Instead, the municipality hit him with an astronomical bill for a years worth of "estimated" electricity consumption. When I got involved, I noticed the address had changed with no consent and that the electricity does not get billed for a year then suddenly they hit their customer with a large bill then threaten if the account is not settled. My Father pays an amount every month and the outstanding eventually became more manageable. Last week, he was hit with a bill of over R109 k which is 5 times more than a year of "estimated" electricity. This for 1 pensioner living on his own who does not even use his stove to cook. I went onto the online portal and seems the June account is mysteriously not anywhere to be seen. No access at all as to how this error occurred. Again I reported the problems and just get an email forwarding me to another person who after 1 week, still has not bothered to respond. If my father does not pay, they threatened to cut off his utilities. So pay up the R109k and then someone may just have a moment to see if there is a problem. How many pensioners have that kind of money? Why should he pay if it is clear there is a major error? The municipality is a disgrace.