Trying to cancel contract but they are wasting tim

We are trying to cancel a contract that we have with Cell C since there is no signal in our region and Cell C are not planning to do upgrades in this region anytime soon. We got a reference number to cancel the contract, but every time we phone the department they keep transferring me to different departments, stating that that is the wrong department. Every time we get to a department that might be able to help, the line cuts off... AND THEY WILL NOT PHONE BACK!!!<br> <br> This is unacceptable that they keep delaying and basically refuse to help us.<br> <br> What am I supposed to do?