Cell C suck

After I upgraded I was told to cancel a recurring data bundle on the 1st of Jan by the sales person in the store. I did exactly that, but was then told to cancel it on the 5th of Jan by the agent. Which I did again. Once my statement arrived, I was in fact charged for this bundle. The case was escalated but I was simply told that I used that data and therefore I had to pay...but if Cell C did their job and cancelled the bundle it would'nt have been used. Now, again for the 2nd month, I will again be charged for this. I find it astonishing that they will not take any responsibility for their mistake. They simply do as they please and there are NO repercussions. Cell C suck