Purchase made using my Edcon Gift Card- *****

On Friday 28 Aug at 09:17 an amount of R3035.35 was redeemed from my gift card *** at Red Square, Stellenbosch. I live in Duran, KZN and all my purchases are made in and around Durban. My card is in my possession. Also on Friday I tried to make a purchase of R450 at Edgars, Ballito and was told I did not have sufficient funds on my gift card. I then paid with my bank card but apparently this amount also went off my gift card!!!! I am getting nowhere with your call centre! What am I supposed to do have these issues resolved! Is your gift cards not secure? How is it possible that a gift card, in my possession, can be used somewhere else?