Contract cancelation and poor service

In June 2024 I signed up for mtn contract using my previous mtn number, I added a router on it which I was told it was around R3500, then in July I added a 2nd line, now totalling to R558. This month end a debit order of R517 went off my account, when visiting their office, they can't see the R517 but the R558.

Again around the 20th of November, I received a call from Mt offering me with an upgrade package of 200GB for same amount, I told the guy about this previous contact and informed him that I took a contact with a pocket router, as he was offering me with this package with a router as well I asked him if it was not a pocket router that I had. The guy told me no, this one was different and faster, to my surprise on delivery it's same router I have. I then contacted mtn last week asking for Cancelation of the 2 previous contract. The agent I spoke to informed me that my 078 number is linked to a router which they cannot be able to cancel unless I pay the router off, so I agreed to do so. He confirmed I should pay R600+which I thought it included cancelation price. He also asked me to wait for my Nov debit order to go off so that I will have an a act cancelation settlement. So yesterday 5went to The Glen mtn walk in office to do the cancelation, I was told they can't do it, I must call customer care, I told them I was referred to them so that I pay and cancel. The lady asked me to call customer care again to get the exact cancelation settlement so I could pay, I did that, to my surprise the guy I spoke to told me cancelation was now R800+. I asked the lady who was helping me in the mall of why am I being charged R517 now, se confirmed she only see R558 on the system, I showed her the amount deducted from my account. I couldnt help it but to go my bank to cancel the debit as now people do as they please on my account. And with all the lies now I feel I must part ways with mtn. I feel cheated with their router story and again, it's so hard to get to their customer care, I don't have all the time to be listening to answering machine, and if they happen to answer their lines are terrible. I need to cancel their contracts, I also don't have network connection where I am so it's very frustrating. I did not expect to be made miserable by mtn in December