I can't believe how MTN is making me pay for the incompetence of their agents

I took out 2 data contracts in Nov 2020 fast-forward Nov 2022 I call the call center to find out when my contracts are ending because I didn't want to continue with them they told me the 6 Dec so I should call back then, I called back on the 6 Dec 22 to cancel the guy I spoke to put me on hold for so long saying that he is sorting everything out, I waited he came back on the call to tell me that everything is canceled and my 1 number is now a prepaid number and the other completely canceled I asked him when my last payment would be he says the payment made on the 1st Dec 22 was the last payment I asked him again he confirmed the last payment was the already made on the 1 Dec 22, I asked about the unused data he said I can use it until its depleted, late Dec 22 I called in because I realized that the other sim card was still active I call in to enquire they say no the number is on per second billing :0 on who's request? The lady tells me "no I will cancel everything the person who had assisted you left it on pending" she did whatever she was doing on her side then eventually we talk about getting another data deal she convinced me fine we go through the process I am not told about pending payment that shouldn't have even been there now my service is disconnected because they tried to debit R530 in Jan 23 but for what because payment is suppose to in Feb 23 now its been over 2 weeks that I haven't been using the data sim but I am expected to pay the full amount in Feb this is ridiculous honestly.