Worst service ever

I have been calling your call center from mid August to cancel a sim only deal which wasn't supposed to be active in any case. Each time one of your customer care consultants transfers me to your retentions department they put me through to a dead line, Ive tried calling the retentions department directly but each time I'm just asked to rate the level of service I received when I did not even speak to anyone!! Does your so called retentions department even exist? I asked one your consultants to put me through to a manager and I was told that all the managers were in a meeting, I requested that the guys manager calls me back regarding my query till date I haven't heard from Nadine Booysens. I called in again two weeks ago and was told they logged a complaint for me and that someone from your retentions will call me in two days and it's been 2 weeks. So now on the 27th I'm gonna have to pay for a service I don't need because no one wants to cancel the damn thing