Line cancellation process with Telkom is almost impossible

I've been trying to cancel my telkom line for 2 months now and each time they tell me my line hasn't been released. I've confirmed multiple times now with my ISP that it has in fact been released; but Telkom keeps sending me the same message. When I explain my line has been released, they just send me the same message. This is the reason people don't want to stay with Telkom, it's ********** service. Feels like they're deliberately just trying to make the cancellation process almost impossible.