Backdated massive bill nearly R10000 due to a system issue

I also wish there was 0 stars. I recently received a massive bill from Supersonic due to them not migrating me to a new billing system internally.

For the last year I thought everything was up to date as they didnt phone me or threaten to cut me off till now. How did they let this slip through.

It shows there is no accountability internally as they are trying to get me to pay the arrears which is not fair.

Also they have admitted the fault by sharing this information and their staff agree there is a fault. Why must I be hit with a difficult expense now. I see they dont care because they dont respond to Hellopeter

If a company can make a mistake like this it means that something is seriously wrong internally.