Renention still not renewed

On the 20 Jan I went to cancel my twee contracts at The Grove at Cell C offices - everything was recorded they told me. I cancelled one but the other I was offered a R29 where I would get a 500MB data and 30 min phone time if I did not cancel it but take out this "Rentenntion contract".... and this would kick in as soon as the previous contract expired. The contract expired and I am still without the promised "retention" offering. I was in Middelburg Mall 20 Feb and spoke to the manager who said he would get back to me. I did not receive anything and after I went in there again, he told me that he was going to phone me at and that was at 17:48. Really?? After speaking to numerous people at Cell C, cancellation are the only people that can do that, but they get an error which who knows who can correct this. I am plain fed up with CellC, I wanted to cancel, they asked me to stay on, and still I am not off the expensive contract yet...never mind the cheaper one that was supposed to have kicked in.