Public company that cannot keep a promise

It started in July when the itemised bills I was being charged for failed to appear. Numerous attempts by call centre staff failed to provide them, so I changed my contract to a cheaper one without itemised billing. However service continued to plummet, as I was charged more than my quoted amount and had additional itemised billing charges added. So WITHIN THE 14 DAYS PERMITTED I CANCELLED MY NEW CONTRACT, but since then all attempts to obtain confirmation of this cancellation have been met with promises stating I would receive an email within 48 hours or someone would call me. PROMISES THAT WERE NEVER KEPT. Even the Vodacom person who responded to my previous complaint on Hellopeter promised someone would phone me, but that call never materialised. Numerous promises from Vodacom Facebook staff to have someone phone me also turned out to be false, as those calls never materialised either. This is my last attempt at trying to get Vodacom to prove their ethics are worthy of a public company before I seek legal assistance which will include the recovery of any legal fees I incur, as well as the refund of the incorrect charges levied on my statement. I am shocked that Vodacom would allow their staff to act in this matter and I have recordings to prove it!