Cell c and what is actually happening

So I started a contract with cell c to add to my credit record as I had none after trying to apply for a bond. Joining cell c was wonderful in the beginning. I unfortunately chose the wrong phone but that as they would say is my problem. So I had changed my bank due to the increase in costs and poor service of Capitec, I joined standard bank, amazing service delivery this far and in the process updated cell c to accommodate for the debit order. After the payment never went through I was notified and I advised I would make payment my very next pay. I then made payment which was the arrears amount and the future dated one due to the 25th falling on a Sunday, I had also received the msg to of the full amount to pay, then the debit order went of on the Saturday in any case without notification there of. Since July when this happened I have not received my full payment. Now instead they want to pay what's credit minus this month's payment, which isn't the main problem till the debit order goes off, I I said no I want my full payment which was more than the debit order. They have declined and due to pain and suffering cause by their interference in my monthly budget I am selling the phone and ignoring the contract. This is my final attempt at getting a better outcome.