I would just go back to wally world and pick up a different one, exchange it, just say you got the wrong one as you don't even need a receipt for that. There's one with just one plug, and it's the model 44-1030, that's like $11-13, and then they make one with two plugs. either of them are nice and are 3 prong for ground.

I agree with the forthdrive, that pic is almost just like the brinks. I just think yours was defective and crapped the bed early...