Woolworths online purchase return policy cost me more.

Online purchase exchange policy I feel is against CPA. I live abroad and purchased "Christmas gift" items on black Friday, at the 33% reduced black Friday prices (3 for 2). Unfortunately the sizes were a little large and my daughters went too V&A Waterfront to exchange them, same for same. Noting that one cannot return online purchases to the online warehouse, so we had to go find a woolworths outlet. We did not wish for a cash refund, we merely wished to leave with the exact same item, just a size smaller. I feel we should not be financially penalised for this simple exchange. However the item was only available online and Woolworths refused to assist us or arrange to get the same item. They would accept the return, but then my daughters had to repurchase the item online and pay in the difference for the current price. The black Friday special 3 for 2 - 3x Dresses at R500 each were reduced to R333 each. So to exchange the online purchase, they will refund R333 and the customer has to then pay R500, for the exact same item, just in a different size! Essentially my daughters had to pay-in an additional R150 per dress, for their exact same Christmas item.