Vodacom charges after cancellation of Contracts

It came to my attention that Vodacom keeps deducting monthly subscriptions for phones where premature settlements have been paid, reason being the Company ceased trading. We have decided to reverse the debit order and requested no less that four times for Vodacom to submit a reconciliation. They are not responding, totally ignoring the issue. I suppose the next step they will take is to issue summons. I have news for them, we are in possession of enough proof that they are at fault. Now I am asking you what is the use of Communication tools if we cannot use it. Shame on you Vodacom. Or is this the way to create healthy Cash flow.