Home Paint Special at Makro Woodmead Sells Rejects

I had purchased a well known brand of paint from Makro Woodmead on the 15/10/2015, the next day i had opened the paint to repaint my house and the paint had actually been separated from the water content in the paint and the paint itself had sunk to the bottom of the plastic container. I took it back on the 19/10/2015 for a refund and the manager states to me that they can't return the paint as I filled it with water after he so called paint specialists at the store agrees with him, makro does not return paint as they are the middle man only, I must submit a claim to the paint supplier as they cannot do anything about it, that makes me question all products found at Makro that are on special, such as foods, beverages, and so on. Is this a sceme by Makro to sell goods that are not usable to clients and then tell them they cannot return it. Is the \Peace of mind policy"just a gimmick to make you think that they provide a good service. Is Makro's 14 day return policy actually a real policy or just something they do to say that they are good retail providers. The management at Makro seems if though they are uneducated people and cannot understand English or even write properly. """