Vodacom - useless cancelling Fibre, wants all the money they can get out of you

I cancelled my fibre in August 2024, yet i am still be billed the the cancelled line. After doing a query, just getting passed from A to B, then B to C, then back to A again...Tried several times to get to the bottom of this, but alas, it is easier getting Julius to vote for the DA....

I need someone with authority to contact me urgently, not a call-centre agent...