When you used the repair kit, did you have to weld? Automender above linked a post about using a clamp, but i'm not sure if we're talking about the same part.You’ll need to either replace the third cat assembly or the cheaper route is to remove what’s left of that flex pipe and purchase a repair kit.
I did the repair kit on my old Sable and it held up for quite a while. I did have to replace the piece because they’re not the greatest quality, but it will get you back on the road cheaply. Attached is an example. There’s plenty out there. I believe I got mine from rock auto or an eBay vendor.