Cell C: Terrible service: Data contract cancellation

I have phoned 5 times this morning already, to get through to the cancellations department. I follow the exact steps required, and each time I get through to the call centre, to just again go through the whole security check again - but no one can assit me in resolving my challenge. Because the Cancellations department have not informed the call centre that there are a 'glitch' in their system, according to the call centre there is no problem. So how do I go about cancelling a data contract, as I cannot get through to the cancellations department?