horrible service

I signed up for a month to month data contract with MTN in Norwood mall on the 19th November 2020. I was the advised that I will have to pay a Pro-rata amount(R155.60) for the 12 days remaining and pay December premium(R389) as well as the activation fee(R115) all together which I did (it was all in all R659.60). at this point i've settled my current bill for November and for the month ahead so my next bill will be for January. I specifically confirmed with the consultant (Theon Naidoo) that was helping me that I will only pay for January as i've covered December as well. MTN then tried to debit my account for December (at that time I didn't even have funds in my account as I had paid my accounts and wasn't expcting any debit order.) after a fail debit order they suspended my connection, so i went to a near by mtn store and was assisted by Boitumelo Kgantsi whom confirmed to be that the payment was not cleared by Theon Naidoo and still reflected as a Pro-forma invoice. Then She notified Theon "Please process the payment so that the line can be reactivated".. from there is was sorted. on the 27th of December I went directly to the shop and paid for my January subscription. Again MTN tried to debit in my account yesterday for and send me an sms saying i'm owing, so I immediately went to the near by shop(Protea Gardens) to find out. to the shock of my life I was told that I owe R399 which I was supposed to pay when i took the contract. i asked how is that even possible because i paid my pro-rata, activation fee and December premium at the same time and had just paid January premium as well so how it that even possible. I was told that I was supposed to pay double (two months premium) plus the pro-rata and the activation fee all at once. which didn't make sense. so I took it up with THEON NAIDOO and send him a email stating how frustrated I was and he should fix this. as if that was last of my frustrations , I got the following shocking response from Theon Naidoo , a service representative of MTN "Hi, This problem started with you reversing the payment, not me.( by the way I paid my bill as per his advise therefor not owing and haven't reversed anything, instead the debit bounced0 It’s not my contract neither my mess, it’s a problem that started when you reversed the payment. The fee was R115, NOT R150.00 I have mentioned everything on my side to you that day, this billing problem started when you reversed that payment from December, hence it is NOT my mess. Hence I have done nothing wrong so I have nothing to fix" Theon is saying this is not his contract nor neither his mess. such rude response instead of trying to fix this. this is basically saying that MTN doesn't care about resolving customer issues as this is not their contract, that's exactly what Theon as a MTN service consultant is saying. I plead with MTN to get this matter resolved and please train your stuff to address issues professionally instead of such rudeness I was exposed to from Theon Naidoo. this makes me wonder ,had it been someone from his tribe he was going to respond the way he did and if so he's not fit to represent MTN with such attitudes. I'm not even sure if this will ever be resolved because the same person that signed me up is being rude with bad attitude instead of helping me out.