The Vodacom nightmare continues

For 8 months I've been trying to cancel a contract . My number is in some bizarre state where I get invoiced but don't get the minutes or data - then I can't cancel my number to port because I'm still under contract. Call center agents are all baffled but not one can sort it out. I even received sms confirmation of my cancellation and the very next day - your contract is in arrears? It's a circus!