Utterly Dissapointed

tried to upgrade but they gave me the run around,I contacted them telephonically thrice & was told its better if I go in store to upgrade,I then went in store twice & was told a different story.I eventually got tired & called again on 2.6.15 but this time to cancel & was told the reason why they didn't want to upgrade.She then told me she can cancel but then I would still have to pay July month as well & I told her but that's not fair as I was given the run around by their consultants & if they told me the reason when I started enquiring in May month about a upgrade I would have cancelled then already.I then asked to cancel with immediate effect & she advised that she cant do this as the system will give me the minutes of which I then advise her I don't even use the sim & I'm sure there must be a way to cancel.I then asked to speak to a manager & she then told me she don't have a manager,which I found strange.She then said Nirvana will call me which is her superior,Up until today Nirvana still did not call me.I called Cell C again & was advised that my contract is still not cancelled & that R110 will be debited from my account.She then said she will trsf me but I got v/mail?