Incompetant and non-communicative

The rentals admin department has repeatedly sent me the incorrect rental amount to pay. As of recently they are now also not sending the utilities breakdown. I have addressed this with Waleed, Anthea and the Branch manager Glenda and my emails have gone unanswered. On the first occasion I paid the incorrect amount as per there email and was blasted by them for doing so. On the last occasion (this previous month, I received yet again an incorrect amount and I requested the correct amount via email. This was not sent. A week later I again requested the amount and I did not receive it, but received an sms and an email from their debit collectors as well as a final red notice from the accounts department with the amount that needed to be paid. I called them and complained about being sent to collections after I had repeatedly asked them for the invoice and was ignored. I then paid the invoice a week overdue, and the next day was sent an email from the collections department informing me that the rent was paid late and would be marked down as such.