Dissatisfied vodacom customer

I have been a customer with vodacom in excess of 10 years, and each renewal i feel like canceling my contract. The customer service is pathetic. I upgraded a package and didn't receive the device I asked for. I returned the incorrect device and followed the channels for cancelation painstakingly for three weeks, yet no resolution. I have been sent from pillar to post. Vodacom will not note a formal complaint, but i am being advised to go to Facebook, I mean really ?? Now I will be charged for services I am not receiving. Vodacom is quick to force you into upgrades but painstakingly slow remedying their mistakes. What is the purpose of customer care ?