Cell C has a Call Centre that's not even customer friendly

I call the Cell C call center to cancel my contract and as usual it's a whole run around. Firstly, there's no need to be verified by 2 different departments before actually being transferred to the correct team. Eventually I was told I would be put through to retentions, however I was transferred to an invalid number. Okay. So I repeat the process, both times being told by 2 consultants that Call Centre hours for retentions are 8AM TO 6PM. I initially called in at 17:45, which left me with enough time to be transferred to retentions. I then get put through at 17:52 - after waiting for 10 mins the automated service tells me that there are no operators available and I should try again later. Having worked in a Call Centre I know that when you close at 6PM your agents are supposed to be logged on to their phones available for calls until its 18:00 on the dot. Bare in mind that I'm the one paying for the call as well and Cell C Customer Care is supposed to be an inbound Call Centre. I am absolutely frustrated to the max and honestly I understand why the rating for you guys are so pathetic.