Poor Service at Cell C

A little bit of a background I had two contract phones with Cell C

Samsung A21s Samsung A12

Two different contracts

In 2022 September I asked if I can upgrade my contract as it was about to expire in October 2022 for the Samsung A12 , I need I got approval for Galaxy Z flip 4 it was for R1000, few days I realised that it was going to be too much, I phoned Cell C for cancellation and the courier cam e and collect the phone in November Cell C billed me R1268 and I immediately sent them an email to say they must reverse the debit order and Take what is theirs which is the amount of the Samsung A12

They continued billing me these huge amount I kept on reversing the payment

I gave them a call to recalculate and send me the correct amount

Up to so far I have never received the statement

So Cell C must get their house in order and come back to me with the way forward and the reasonable amount of pay not what they are asking