Refund not dealt with and pathetic feedback

I purchased Dischem vouchers on 24 July 2015 and realized i had made a mistake (paid with credit card instead of ebucks) so I called the call center *** 10 mins after I made the purchase and asked them to cancel the transaction. I was advised it was cancelled but 3 days later the vouchers were delivered to me! Once again called the call center and told them about this. Eventually after a lot of calls and escalations the vouchers were collected from me on 13 Aug 2015 (3 weeks later!). The refund for this was supposed to be done by 18 Aug 2015 and has still not been attended to. I have been calling the call center and so forth constantly and have no joy to date. The consultant dealing with my issue (Decklyn Pretorius -Senior Multi-Skilled Consultant *** ) ignores my calls and emails and does not provide me with feedback. I am completely frustrated and dissatisfied as I cancelled the transaction before delivery was even made and yet somebodies incompetence has led to the vouchers been delivered to me. I no longer have the vouchers in my possession and still my money has not been refunded nor do the consultants care to sort the issue out! unacceptable