Overcharged on Electricity

For a person that was never behind in my City of Cape Town bill I am frustrated with the City. The City overcharge me on my Electricity bill with 3x times as much. My bill of normally 3k change to 11k. The response was estimate was done wrong and they sent someone out to do actual reading but in my opinion the credit was not done properly. In March no bill was received call the call centre and agent promise to send the bill. But the bill was not sent and received one on the 24th. Now a person that was never behind on the bill is behind because of the City of Cape Town. This frustrates me. Call Reference Numbers *** *** *** *** *** ***