Billed but no phone

At the end of March 2017, I upgraded my contract with MTN and was to receive a P8 lite. It became very apparent that there was huge issues when I had still received no handset by the end of April. I have tried calling - but no department is willing to help. I have sent messages via facebook, twitter and email - with no responses. Finally when someone called I requested a refund and cancellation. And then what happened? NOTHING!!! 5 months being debited but without anything to show for it. Some agent called me, was rude and unhelpful and told me that he could (as he wasnt able to answer anything else) stop the debit order - and then? IT CAME OFF AGAIN. I want my money back immediately. I want no more dealings with MTN - they are *******! If no refund is processed I will lay ******** charges.