Hidden Contract Costs

I have renewed my contract and taken an additional contract out for my husband with Telkom on 22 August 2019. The consultant that was helping us initially wanted to charge us an amount of approximately R1 300 for the remainder of my contract (as I was due for renewal as my existing contract was 21 months old) and she wanted to split this over a 2 month period. We refused to pay that amount has it was not required for us to do so and a senior consultant told her that she was charging us incorrectly. Once the contract was finalized, we have ask her to write down the breakdown of the charges (as per the attachment) and what we will be paying at the end of September 2019 (the breakdown for the P30 Pro+ Combo @ R849.00 + R40 [100 minutes] + R99 once-off fee and for the iPhone @ R1 149 + Sim and Connection fee R99 + R80 [200 minutes per month]) . When I went into the Telekom app, I have seen that the amount of R4 418.51 is due to be billed at the end of September 2019. We phoned the call centre immediately to query this amount and they told us that we were charged R2 000 extra for the device for the remainder of August and for the month of September 2019. We told them that we were not informed of this amount and if we were, we would not have taken the contract out with Telekom. The call centre agent advised us to go back to Carnival Mall Telkom and query this with them. We were told by the Carnival Mall Telekom floor manager Brian that these costs should have been explained to us by the consultant. We proved to them that the breakdown of the costs that was written by the consultant did not include the additional R2 000. They said that we signed the checklist (that does not give the breakdown of the costs) and that there is nothing that we can do but pay the amount. They have opened a dispute case with reference number ***7 to dispute this and said that regardless of our dispute, we are still required to pay this amount. This dispute was closed without consulting with us on this matter.