Conttract cancelled,debit orders NOT stopped

My contract with cell C were cancelled on 28 April 2015,and as from 29 April 2015 I had no contract with Cell C and only operated my phone with pay as you go vouchers.<br> On 3 June 2015 Cell C debited an amount of R1602.85. My normal contract price were R598 every single month for the previous 4 years.<br> Then I reversed the debit order and again they debited an amount of R1602.85 on the 26th of June 2015. And then on 630 June they debited R 1957.00. I had to reverse all the debit orders and requested my bank to cancel all debit orders from them.<br> Then on 31 July the again debited R 2966.29. I have lodge a complaint with Cell C with no response.<br> I demand that they stop all future attempts to debit any amount from my account. I dont owe them a cent and I have no contract with them.