Contract Cancelled, Why Invoice me?

***<br> App**** for a contract on 15th Feb 2016, then called back on 16th Feb 2016 to change that package as it did not include data. Baratoa explained that in order to do that she'll need to process the cancellation and restart the application process again. On Thursday 18 Feb 2016 the phone device was delivered which I indicated to the courier that I will not be taking the phone as MTN notified me that they processing the cancellation. To date I have not received any feedback from MTN to confirm that they processed the cancellation, every time I call to follow up on status, I am not given a straight answer and I keep being told that they'll e-mail Baratoa to call me back. Yesterday I received an invoice, which tell me the cancellation is not processed. <br> Cancel this contract as I requested on 16th Feb 2016, your account reference number is A***.<br> <br> Please give npme proper status feedback.