Rude and disrespetful owner

I recently bought a ladies polo purse, from Diplomat luggage store in Green Acres Port Elizabeth. I phoned Diplomat twice for two styles of ladies polo purses. The first time I phoned the owner's mother pricked up and was really rude over the phone. I asked her if she will be able to match Frasers price for the same purse and the she told me if I want the purse I must go to Frasers and buy it at that price and not to phone again. I still wanted to find out a price on the other style of purse and phoned the following day and the same story again. I waited a bit long and Frasers was sold out on the purses and went to Diplomat. Before buying the purse I asked to please provide a discount on the purse. That's where the she slammed her hands on the table, customers looking, and rudely shouted that's my price take it or get out of my shop. I still bought the purse. 3 days later I return the purse as it was incorrect. She and her husband started shouting, customers looking, and said she cant provide a cash refund. She treated me with utter disrespect and after a long debate did a credit refund onto my card which takes 3 days to reflect. I want to warn customers not to buy there at all