Vodacom stonewalls cancellation, locking one into unwanted contracts

I have spent countless hours since 6/10 trying to get an upgrade cancelled within the 14 days cancellation period because the upgrade phone was not delivered. I have spoken to various consultants, written emails, complained here and onVodacom's facebook page and their Messenger account and NOTHING changes. I have never ever experienced such terrible treatment (cannot use the word 'service:)