Still no Customer Service

I wrote previously about struggling to get my upgrade done online. I received feedback from Vodacom advising the issue has been addressed. Addressed??? my word how do you address a problem and after 11 days it is still not resolved. This is terrible service from Vodacom. I would have hoped that for such a big organisation they should be able to fix their IT issues in a flash. I am still on the old system and apparently they could clear it in order to process my upgrade but then I received mails and calls for 11 days that they can't process my delivery address and it's been escalated to back office to be resolved, who ever back office might be, they can't fix the problem. As my number is the main account holder on my contract. Please advise if I can cancel my number in January when my contract expires.