Poor insight and tact

My boyfriend bought me jeans at Edgars Carnival mall- on fitting them at home they were sadly too tight. I decided to take them back to my closest edgars - lakeside mall. I asked my mother to return them on my behalf due to a twisted ankle I couldn't go myself. My mother called me from the mall saying that Edgars Lakeside mall WANT the bank card which was used to buy the jeans. UTTER NONSENSE -this is how card cloning happens - what exactly do they need the bank card for? I had the original receipt. Why is that when I have to exchange or change my mind on an item Carnival Edgars NEVER gives me a problem??????? I am really sick of the Lakeside edgars staff- like I'm really sick of them, if it's not attitude it's such treatment. Unfortunately my mom didn't get the lady's name - I would be in her face like a rash. Even with my lay-by all I got was a short fat lady telling me that my ID number is useless to her- like how was I supposed to know that??? What she should have done was say that she's going to need my cell phone number as I didn't have the receipt of the layby-not the nonsense and attitude she served me. Wooooooooooo I'm so disgusted and bored at this moment. The refund/return policy says nothing about Bank card - absolutely nothing!! If it's the case then people need to made aware of it and written at the back of the receipt.