The most disgusting service received

I have incorrectly billed for the Fiber service that i have not been using since March 15 todate and they are still billing me regardless on me having notified them of me being unable to pay the account anymore due to financial constrains in January and again in March when i was moving houses.I am calling daily to Vodacom and being send from pillar to post and spending at least 2 hours on the call being send from one department to the other after having logged the dispute. I am being promised to be called by someone each time i am following up on the dispute i made and no one ever calling me.Today is the 8th day since i logged the dispute and still being told that someone will call me.I have tried everything including their customer care with no assistance received thus far.Please assist as this account is hurting my credit record on the bereau