Reached my limit!!!

At the beginning of April I discovered that one of my lines had been **********ly upgraded and I was now being charged R709pm as opposed to R149pm on that line. I was hugely inconvenienced by having to PROVE that I never authorised said upgrade. Nevertheless I did as was asked and went through the mission of getting a sworn affidavit so they could start their internal investigation. EVENTUALLY this was done and I received confirmation that my line had, in fact, been **********ly upgraded. Yesterday I received a statement that still reflected the incorrect amount, so I called 111 to enquire as to my actual balance and it is still wrong. I have logged a complaint with 111 and decided I'm so fed up with Vodacom I want cancel my lines as they reach expiry. I have had enough!!! THIS IS THE WORST LEVEL OF SERVICE I HAVE EVER EXPERIENCED!!! However, I cannot get through to the cancellation department. I WANT TO SCREAM!!! FIX THIS NOW VODACOM!!!!