Bad support service in accounts

I’m convinced that Vodacom intentionally provides bad service. I cannot believe that every time I call Vodacom they’ll pick up my call in a few seconds only to make me wait for 10 mins or until I hang up. This is all the damn time. I have been trying to cancel my fibre since last year because it drops all the time, it was worse after I put in the cancellation, it’s like they intentionally sabotage you. You call and they answer and put you on hold forever and never really get back to you. I’m convinced that they intentionally don’t prioritise certain customers. Account still debiting although the service was cancelled Nov. No one wants to assist. What am I supposed to do?