I got $1000 refund advance. When I get my card if I don’t use the whole $1000 before my refund comes do I only pay back what I used

Not sure you understand the "loan"  situation ... it is really an  advance of the anticipated refund ... so if they gave you $1000 on the card then the balance of the refund comes in it is also put on the card.  The amount you have used is immaterial to the bottom line of the refund received. 

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Thanks lol I thought that’s what it meant but they used loan and I was confused