Woolworths store manager has no concept of the meaning "customer Service"

On the 14th April I purchased from Woolworths Morningside Shopping Centre Sandton, 6 packets of Free Range Beef Droewors 150g and paid R99.99 each. My total spend that evening was R1829.87. Then on 16th April I purchased from Woolworths The Wedge (which was probably 750m away) another 2 packets at a shelf price of R94.99 each. I tried to get a refund for the difference of the higher price I paid 2 days prior. I was told that I had to go back to Woolworths Morningside, which I did. I first spoke to a cashier who then called a "manager" who refuse to entertain my request saying that prices changed daily and he would not help me. I consider myself a VERY GOOD customer of Woolworths and have never had such BAD service. Unfortunately I did not think to ask for his name. If the store was not so conveniently located I would boycott this store. The gentleman in question should go for further training.