*****ulent charges after contract cancellation

Vodacom are a bunch of *****s. I was stupid enough to sign up for home fibre when one of their outsourced agents showed up at my door. The rates they offered were good and they said it was a month to month. With no prior warning after 3 months they were charging me almost double and I was not willing to pay this as this was never explained to me. Account was cancelled and I settled account in full. Soon after VVM debt collectors start calling me and saying I owe Vodacom money. I request a statement and see that they are charging me over R1000 for a router that sold for R400 at the time and they are charging R1700 for an ONT installation which was done years prior to me signing up with them. In fact no one from Vodacom even set foot on my premises, they sent the router via courier and I had to do it myself. I will be escalating this to the NCC as how can a company as big as Vodacom try to *****ulently charge for something they never did.