After you put oil in them, most of the possibilities for repair will no longer fix the leaks. It would be quite difficult and time consuming to try to get all the oil out of the crimped joints for certain so an attempted repair might be successful. If it was new, and clean and dry throughout, a low viscosity, slow curing two part resin might cure in the crimped seams as it leaked, fixing the problem. Sometimes it is smart to pay attention to product reviews. I do not know where you can go from here that makes more sense than throwing them away and starting over with a different product, perhaps one with good reviews...