Call Center Manners and Co operation

I have an ongoing issue with the billing division of MTN, last month I phoned the call centre as they deducted more than the balance amount on my bill. After a long explanation eventually the agent on the other side understood what was happening on their side. He suggested that I reverse the debit order and pay the correct amount as per my invoice received. I did exactly that- today my line got suspended and I have been advised that my account is in arrears for more than 60 days. I tried explaining the situation to Agnes from the call centre, who was adamant that my account is overdue, I requested her to look at the history on the account and add the payments and she will see that all adds up. She got irritated and placed me on hold without advising of her intention to do so. She confirmed that the last payment on the account was made on 1 July 2018.... guess what lady its only the 17th of July today, how is my account in arrears for 60 days then? I requested to speak to her manager, and she advised me that her manager, Sandile Moeletsi is too busy with an escelation and advised that my line will not be re activated. Needless to say last month I had the exact problem with the account but it was resolved quickly and easily as the agent on the other side actually listened and looked into the matter instead of getting arrogant and telling me to mind my manners, and this after the 3rd agent that I spoke with that promised my line would be re activated. Thank you for your service for the last 8 years, I will definately not be making use of your network once this contract expires.