Safe t claim denied for buyer claiming item not delivered

discussion.a few weeks ago as ive been fighting the safe t claim alot, was a refund request stating item not delivered. It was a fairly decent sized order around 55$ or so. Buyer claims item not delivered but upon looking at tracking it had been delivered a few days prior. I even went ahead and went to ups site and got deliver proof which included a photo of the front porch of the home. Showing it was delivered. I filed a safe t claim and was denied for "non returnable item". Like im not looking for a return im looking for me to get my money back when she clearly got her order.

112-5649550-1797848 this is the order number if someone could explain why this keeps happening everytime I file a safe t claim and provide proof thanks.