Bad customer service with incorrect billing

Today I received a text that my account could not be debited the amount of R608. I called the call centre and spoke to Duyllan Williams who told me about me having to pay over R1100. When I took out this price lock on the 09th June, I was informed my subscription for the next 24 months is R549 nothing more nothing less, and that with the Explora package I can only upgrade and not downgrade. The package was installed on the 14th June and since then the R549 is the amount that has been debited from my account as I took the price lock promo. It's only recently on the 17th July when I took out the insurance on the decoder which should have brought my subscription to R588. However Duyllan told me about extra view charge and insurance for the old decoder which is not even connected as I only have one TV set not to mention the insurance on the previous decoder was cancelled with immediate effect on the 02nd April 2021. When I asked Duyllan to put me through his Manager he said there was no manager, then i asked for the Manager's name whom he gave as Greg Samuels and as he was spelling out both his name and the Greg's number his tone was very condescending to say the least. He then told me it would take 10 - 15minutes for his Manager to come to the phone I told him I do not have that much time to hold. I asked to request that his Manager call me back and he had the audacity to tell me that his Manager will not call me back ad he's very busy. We are all very busy by the way and one would think a big organization like Multichoice would ensure that they callback their most loyal customers, but I guess that is not the case. I am frustrated and there's still no resolution regarding this matter as he ended the call offering me further assistance when he failed to resolve my query. In all the years I have been with Multichoice, I have never met a consultant that had such a bad attitude alone the worst customer service by far.