Blocking of contract while arrangement was made.

Arrangement on payment was done start of May 2015. On 30 May I visited Cell C, Woodlands to confirm debit order on account for R3500 and was asured that Cell C will deduct amount and service on account will be reinstated. On 1 July 2015 I discovered that my number was blocked and does not exist anymore. I could not phone Cell C help desc and my husband did so. He was advised that we must mail them as they can not discuss my account with him. After we mailed Cell C we were send from one Cell C address to another, we were also advised to contact Cell C legal department. This number could only be reached twice in 5 days time. The first time was when my husband spoke to Christene, she told them she will phone him back in 30 minuts time and would also mail him so he can reply with proof of payment directly to her as she needs to unblock the number. He never got any reply from her. After struggling for 5 days I also got hold of lergal and was told that they can not unblock the number and I need to pay the outstanding R9000 on the account for 2 year contract. They also said that they stopped the debit order themself. I did make the neccessary arangements and Cell C do not want to resolve.