Have not been refunded to contacted in a month

On 26 November 2015 I ordered a cake pan and a frying pan online from Boardmans. Both had to arrive in time for various gifts. when after a week it had still not been dispatched i call the call center and was told that the cake pan was out of stock and they would send the frying pan. However that took a week to be dispatched, meantime i had gone and bought the cake pan elsewhere. When the delivery arrived, the frying pan was missing and the box contained the cake pan (that was out of stock) and a gift card supposedly containing the R650 of the frying pan. In a rush i went online to order a different frying pan using the voucher as i needed it by the 18th of December. When i tried to pay using the voucher it wouldn't work, in the end i had to pay a further R670 for the new frying pan order. I called the call center again and after being put on hold for 20 minutes i was told that the voucher was never loaded. Since then i have called numerous times, sent about 10 e-mails and have had no response of refund. All the call center says is that they will \escalate the matter to a manager"i have heard it so many times it has become an empty phrase. I'm not gonna drop this I WANT MY MONEY!!"""