Jewellary returns

Bought couple pairs earrings on sale at 11.45 today. Got home, saw that 1 pr was discolored and rusted. Took them back to the shop at 14.15 same day. Wanted to swap 2 pairs with something different. Was told I couldn't return earings. No sign up stating this policy. Cashier refused to swap the earrings, only taking back the rusted pair. Got to speak to the person apparently in charge on the day on the phone. This led to extremely rude supervisor telling me that no other shop would ever let me return earings. I asked why did they not have a notice to this effect, or at least tell the person purchasing them that they can't be returned. She simply kept on telling me that no other shop, including Woolworths, would not let me return earings. In the end they allowed me to change them. I went straight to Woolworths and asked them what their policy was regarding returning earings, and they said of course they will allow returns, and that Lovisa is lying. Extremely bad customer service from Lovisa. Leaving people in charge of a shop who have no authority in making a decision on a matter which might need to be considered out of the policy rules, is setting the business up for a failure.