Umarex USA I purchased an air rifle, supposedly good for shooting birds and varmits. It does neither and they refuse to accept a return Ft. Smith Arkansas

I purchased this air rifle to keep birds out of my vegetable garden and when I used the air rifle it was so weak that when I shot a bird all it did was knock a feather or two loose and the bird flew off. This was from a distance of 12 feet. The same thing happened when I shot five more birds. When I asked to return the air rifle I was told that it was unreturnable because of HazMat concerns. If that was the case, then how could they ship it to me. They have a win-win business here. They never have to worry about making refunds, nothing here but profits for them.