Bad Service

I have had quite a bad experience at Midas hiPerformance retailer.. I purchased one garden hose and a soap dispensing sprayer gun, of which I returned the hosepipe as the one I purchased didn't work, they gladly exchanged it.. But I returned with the sprayer on Sat 17 Oct, as I tested the sprayer and it did not spray as it should..it spayed not even a rulers length in front of the the gun, which to me means it doesn't work, as a normal hosepipe sprays further.. So I requested from the gentleman to simply show me how it works maybe I wasent using it right?. I was told that the pressure isn't Enuf, I then stated that I connected a pressure washer for more pressure.. Amd then was told it needs less pressure, I mean make up ure mind.. Was told it WAS meant for tap and hose application, but still doesn't work.. at the shop to make it spray, not my problem, and was told that if we were at his house becoz he has borehole water it would work, once again not my PROBLEM ..I had my slip with, but didn't have the original packaging, the item hardly had packaging when I purchased it.. To my knowledge if one purchase an item and it doesn't work, one should return it. No Solutions was offered to exchange item? and the gentleman was rather rude and told me there is nothing I can do.. And was told the item isn't guaranteed.. Do I need to ask Everytime I walk out of thier store if items are guaranteed? Is this how Midas operates? It's only R80 bucks hose but the principle remains, the service was bad and very argumentative and did not allow me to even speak.. Won't use them again, I run a business that needs items like these to work Wen I buy them.. Does Midas sell items that aren't guaranteed?