Debit order

I have a cellphone contract with MTN and everytime they have to debit they overdebit me and this has been happening for quite sometime,And when I call their *********** call centre advisors they tell me about escalating my issue but yet no1 comes back to me. Today(01/07/20) was worse. I upgraded my contract on the 12th of June and I was advised that no pro rata will be charged and guess what today a total of R1010 was debited but normally R489(for both devices on my account) is the amount that they normally charge, Their contact centre advisor by the name of Karabo who put me on hold for like 10min told me that I have out of bundle usage/charges which I have no idea of and that she will escalate my query as she also does not understand the extra charges, KINDLY ASSIST PLEASE AS IVE HAD IT WITH MTN and to top it off my bank charged me an amount of R61 for unpaid item and my multichoice debit order came back unpaid because MTN OVER DEBITED ME and I would love MTN to waiver all those charges because it's clear that they do not value loyal customers.

Date called:01/07/20 Escalation reference number:*** Agent name:Karabo Time:20:52