Forcefully being charged fees that I said I would not be able to pay

I received a letter that my premium is going to increase from R750 to R850 for 3 tracking devices that's when I realized that I have been paying different amounts for the same package for 3 cars. I called in twice to get this fee reduced two months before the increment and still my account was charged with the amount that I specifically said I would not pay. I reversed the amount and called in to tracker and they said that I now owe R1500 for 2 months when it wasn't even November yet.

I told them I would not pay that amount as I informed them two months before that increment kicked in that I would not pay that R850.

I've spoken to Tshepiso and Khalipho who have said the matter has been escalated to their superiors as finance still has not fixed the issue on their end and now I'm being charged R60 for reversing the money that I said I would not pay and receiving sms's to pay the R1500 via eft and still I have not received any email that this matter has been rectified.

I'm on a month to month with two of rhe cars and will definitely be canceling that contract. This is ridiculous!!!