Cancelled contract or not

<p> My wife had cancelled her contract ( ********** 680) in May 2015. Shortly thereafter we were told that there was a small amount outstanding which was paid. She has now received a lawyers letter demanding payment. When asking what it was for she was told that it is a cancellation fee. After providing proof, she was told it is an outstanding payment. She has been threatened to be black listed. Trying to contact Cell C and get through to a person that can assist is impossible. Their accounts department apparently don't take calls. This is not the 1st time we had issues with Cell C. My daughters cancellation had the same issues. They promise all these wonderful things in their TV ads and use high profile celebrities to get the message across, but beware if you have an after sale issue or an account query. Yes the amount is insignificant, but it is the principle of the matter. Is there somebody at Cell C that will listen and sort out my wife's issue.</p>