Refuse to refund me

On the 29 Dec 2017.. The lady who was in charge (supervisor) refused to give me refund, yet the jacket was in the good condition with swing ticket attached, I bought this jacket on the 23 Dec 2017(five days ago), I gave her my bank statement as a proof of purchase so she can see the transaction because I lost my receipt.... She told me that she can't help me... I don't understand why she's can't.... She was very rude and unhelpful... I'm disappointed.. What a bad customer service... I don't think I would ever want to go back to the shop at Mr Price....