false adverti*****t

the past friday 28 july i purchased 2 cotton stretch tshirts at woolworths rivonia and i was never asked for my woolworths rewards card for a discount ,i got charged full amount yet it was supposed to be R200 .I noticed this on the receipt and couldnt turn back.i then attempted to return them as carlton centre woolworths and custome consultant said they cant help me .i would appreciate if their promise would be kept true as their adverti*****t that theres discount valid vouchers PLEASE