Woolworth's refused to exchange my top, as I have misplaced my slip

<p>I bought a top at Woolworths , I did not try it on, it did not sit well with me , so I decided to return it today. The manager from Woolworth's refused to change, he told me, I must come with a slip. When we buy they don't give us any info about keeping the slip safe, I am regular customer of Woolworth's always buy from the store. Just because I don't have a slip I must be stuck with something that doesn't fit me . I want this top changed today, pls Peter help me</p>