Arrogant and Rude Edgars Store Manager

On Sunday, 9th June I returned a pair of adidas sneakers at Boitumelo Junction Edgars storeI had bought on promotion,because they did not fit I tried to return for credit. But, I had lost the receipt, fortunately because I bought them on account I was confident tgey would print a new receipt. 1st they make me wait 20minutes because the store manager "was in another store" After the wait I had to ask them to call the manager. When eventually the Manager arrived, she first went to the back of the store. When she returns, I tell her my story. To which she tells me that its store policy that goods bought on promotion cannot be returned for credit. By now I am fuming and I tell her how the hell am I supposed to know that, That I am not an Edgars employee and as such would not know policy. She rudely leans over the counter telling me that its written "there"!! To which I reply again how the hell am I to KNOW THAT!!! THAT WHY DO THEY NOT TELL ME WHEN I BOUGHT THE ITEMS ABOUT THE POLICY OF NO-RETURN ON PROMOTIONAL ITEMS, because as she put it "We want to get rid of stock" She then says she can give me a gift card. I tell her I dont want the damn card but want a credit. Its that simply. She shrugs her shoulders like "thats not my problem" I am tired of people being paid for a service thinking they doing us a favor!!!!!! I want my credit.