BRIDGE OF CONTRACT: CELL C: *****ULANT DEBIT ORDERS

I have been a customer for many years and had and still have several accounts with them. But seeing that cell c don't cell Iphones, I bought the handset and kept my contract at a very low price. So in the beginning of this year, I was harassed by one of their salepersons to upgrade my contracts, it would cost me merely as little as R10 a month. I eventually gave in after they started to harass my daughter who has one of the accounts. I was told that he would only activate the new contract end May due to my current contracts only expiring then and that I then dont have to make double payments. So in the beginning of June three amounts went off, R219.41; R201.57 and R182.70. I went back on my emails and read the original contract send to me on 19 February 2024. So according to my contracts I would pay for contract (1) and (2) R199 minus R107.36 = R91.63 and for contract (3) R209 minus R93.40 = R105.60. Totalling R288.86 I reported this immediately to CellC via email addresses but did not hear anything from them. In the beginning of July again 3 amounts went off R381.28, R362.44 and R200.13 = R 943,85. Again I send emails and proof of payment with the relevant contracts to CellC. On Wednesday, 3 July 2024 I was contacted by someone of their call center to inform me that going forward I would be paying the full amount. But that is not what my contract states. I dont know what to do. Open a ***** case against CellC???????