Cell C Not Concerned With Customers

So I decided to take up a Cell C offer to have my fiber contract with them, their offer can with a free 3 months subscription which includes Black. Needless to say since October my Black service has not been activated, I have on numerous occasions requested the voucher number to be sent from pillar to post. To add insult to injury I have sent numerous mails and to this day no one, I mean no one has been able to assist me. I have been on a call with their agents who couldn't even assist me and I had to spend over 1;45 just to reset my fiber password. I would to put it that Cell C is the worst service provider and I am not being treated as a valued customer. This is the very last resort and I want OUT! Upon signing up I was told my email was registered and the gentlemen who came to install made sure, however I get emails telling me my email is not registered. I have been going back and forth with no one assist me. I have called, tweeted, emailed and still no assistance what am I expected to do now go Camp at their offices for help!!!