Vodacom literally *****ing money from my account

Vodacom sold me an LTE data contract under false pretenses - there is no coverage for my area on their map. My internet access has been abysmal at best because of this, and I spent months trying to troubleshoot it at my end. They finally admitted this, supposedly cancelled my contract and took back the router. However, they are still billing me their exorbitant fees after removing my means to use their service.