Price Lock Cancellation

I had taken a Price lock package with Dstv, and moments later i have decided to cancel it. I called Dstv to cancel the contract before it even becomes active and even before they dispatch the decoder to me, they told me it been escalated to the Price Lock department. I called in the next day to query the status, and was told again it has been escalated to the Price Lock department, I then spoke to the manager and he advised me that they can only cancel once i receive the decoder. The day i received the decoder, i called in again and yet again i'm told that it would be escalated to the Price Lock department. Few day later they had come to pick up the decoder from me assuring me that it has been cancelled. Today i see my bank account has been debited for the Price Lock contract. I called Dstv this morning and again they have told me it has been escalated to Price Lock department and they would contact me ASAP. Guess What, no call as yet. I demand a full refund as i no longer in possession of the decoder and all my calls and emails to show that i requested the cancellation