INCORRECT BILLING

Joined Rain Unlimited 4G 24/7 and used 0.0574 GB 31/03/2020 - 31/03/2020 got billed R15.46. Had to cancel service because I relocated and network was bad. Cancelled Rain 01 June 2020, and used 0.0228 GB 01/06/2020 - 30/06/2020 got billed R 479. How is does that make sense? FAQ: Simply log onto your desktop dashboard and cancel your SIM. The cancellation will take place on the last day of the month, but you will only have to pay for the data you've used. SO WHY DID I GET BILLED FULL R479 AFTER CANCELLING WHILST I ONLY USED 0.0228 GB??? They keep writing "Thank you for you message. We've flagged this with Management Team. We've received your request | ***