Cell C incompetence

I had 3 contracts with Cell C. I upgraded and it was a out of box faulty phone. On 29 of May, Cell C arranged to pick up the phone and asked me to wipe and reset phone and place it in its originalpackaging. . It took 2 months to put me on pay as you go and cancel the contract. I paid in full for the 2 months, without having a phone. A Bill dispute case was opened and I found out today that the case is closed , but you have not credit my account. Your operators says there is nothing they can do due to case is closed. Now my other 2 contracts are going to be cut due to non payment. I need to be credited.. I have over 10 cases regarding this matter. Ronald ***.