Customers Care non-existent at Vodacom

I cancelled my contract that had 2 lines in Oct 2020, they decided to cancel only 1 line. Been calling them since December when I realised that I'm still billed for this account.... mind you, you hold for the longest time before anyone answers. To date they are still not sorting my account & harrasing me with collection calls daily.... The collections department say I must call the cancellations dept.... The cancellations department are saying it's the back office... but they refuse to give me a contact person at that back office, they say I must wait for them to call me... in the meantime collections department is sending a different person to call me every morning... The staff is always rude & unhelpful.... they refuse to give out numbers or email addresses of their superiors and will not escalate queries. I thought I got help from their customer care team leader who promised heaven and earth, he also went mute & not responding to my emails. There is no competent human being at Vodacom... they must ask Alan Knotcraig to come back from retirement again to rescue them..