Cell-C, Banking Change Worst Nightmare

Received sms from cellc yesterday that my account is suspended, after 2 months of providing them with my new banking for them to change my debit order,

So after the 20th time calling their call centre to fix issue they told me they could see the error on their side, debit order is getting rejected immediately its the banks fault they say, so through my banker I’m informed issue with CellC as all my other debit orders are deducted fine, and no reference for a rejected debit check on standard banks side, which is what CellC is claiming

So instead of inconveniencing your clients and being quick to suspend, sort out your inhouse systems, now my wife and I's contracts are suspended because you cannot sort out your debit order/check, a de******eck I was told would get shortly this morning is still not showing on my banking app, let me know is you cannot sort this out as I would gladly cancel this contract and get another from a provider that knows how to debit their money from my account