No exchange of CWC branded product

Got CWC branded mtb grips on black Friday as a gift. Tried to exchange them and buy something else but was refused. Not because they were not from CWC but because they could not verify the sales price. While there is no obligation by law to exchange without a slip I found it very poor customer service. I spend thousands of rands at the store evert year but no longer. CWC your attitude has turned me away to other online shops. Bye Bye.