Dick's Sporting Goods

If I'm taking responsibility of taking an item from Dicks, how are you still liable? What's the difference between putting a large item in the car or on top. Its freezing rain, and i'm standing here by myself trying to load this item and its too heavy. They're response was they can't help me lift it because of liability reasons. Is it not my responsibility once I take the item from you to properly strap this item to my ca you should be able to assist me to lift it however I choose. Now i'm soaked and my item most likely is as well. Thanks for nothing.