Can't cancel vodacom sim only contract, forcing me into device cancellation structure.

I've contacted vodacom 3 times now to cancel my sim only contract. However they have and old device still logged to my profile which means I can't get the 1 month cancellation fee and get quoted the 75% fee that's for devices.

Everytime I call they say phone back in 48 hours, I called back after nothing was resolved, then called back after a mount was told to call back after 48 hours again. This feels like they just wasting my time so they can take more of my money.