COJ maladministration resulting in arrears

My electricity meter was change to a smart meter on 16 March 2019 which COJ did not update on there system until April 2020 now I get a statement saying I owe them R19 104.90. Below my email to them which i await a response.

Hi

Please explain how I owe you guys R19 104.90 when I have been paying MORE on my account every month based on the statement you send monthly, that state ACTUAL READINGS. Please explain how when: 1. I’ve been querying these readings cause your info was wrong 2. In 13 months nobody came out to check the readings AFTER MY 3 queries 3. Your recent statement does not have readings with the billing period and have three steps whereas the monthly statement had 2, you are charging me an extra step based on what. 4. Must I now just except that this info is correct. When in the last year it was wrong? 5. I do not think this process is fair due to maladministration on your part. As a consumer I have fulfilled my every obligation you set. 6. This is now the third time I’m in arrears due to incompetence on the part of COJ.