Bad Service from MTN SA

MTN SA, unable to sort out a billing issue on my account for the 2nd month in a row now, upgraded my contract on 2 June 2020 & have been overcharged since then. MTN does not get back to you regarding the query so I have to keep phoning them, queries get closed without being resolved & the billing issue just goes on. I'm regretting upgrading my contract.

MTN SA - your urgent response to this will be appreciated, if no response I will take the matter further. Nicola - unsatisfied client!