No customer service Ethics and Accountability

On Sunday 22-02-15 went to Edgars Canal Walk to purchase some birthday gifts for my nephews. was assisted by Thabisa Mithi I asked her for a gift receipt for the clothing purchased which she forgot to print but offered to cancel the transaction an put it through again ,which I refused. Then upon returning home looking at my slip I noticed I was charged the full price of the clothing instead of the discount which they advertised. I then called the store immediately at 7pm the evening my call was answered after 20 mins of continuous ringing, finally when my call was answered I told them I waited 20 mins to get through the lady laughed and said I was lying . I then asked to spk to the manager Donavan Hendricks who took my details and said he would call me back to verify in a couple of mins .I waited and waited . until the next day mon 23-02-15 at 5pm I called him again I asked why didn't he call he laughed and said the system was off, I was furious now. he took my details again and called me to say they made a mistake. I must come in again whenever in the area to be refunded. cant believe the way this was dealt and by the Manager, my time, calls and petrol there mistake wow.