Cell C billing ****s

Cell C is ripping me off. Cell C billing is a **** & the *********** staff cannot help me since they don't even understand the billing. I could not resolve the over billing issue with call center agents (who put on hold for long periods of time & if the call cuts off will not call you back) so I used the online query. I was called at an inconvenient time (during physiotherapy) which I could not answer & then received an email stating that they tried to contact me with no success. Really, after being over-billed for such a long time, nobody makes an effort to resolve this matter. Contracts I did not sign up for are now in my billing. Cell C MiAssist subscription that was canceled within 3 months of taking it last year April is still being charged to me. Are Cell C such cheapskates that they need to resort to such *****?