Poor service

I had a very bad experience with the manager at this shop about 2 weeks ago. i bought a box of 1 litre Robertson dry white wine. when i got home i realized it was water inside so i later returned it only to be insulted by his response to say i must contact the supplier as when i bought it dealt with the supplier. his response was why did i return it 2 hours , i mean really was he expecting me to buy the wine and drink shortly after. since when does a customer need to deal with the retailers suppliers if they were dissatisfied with the product really