copper pipe from china
Who would you go to/sue for satisfaction? - God or China? - You would have show there was something wrong. It is like trying to sue God after tripping on a church sidewalk after someone said it was an "Act of God".
Ultimately, whoever bought, stored, supplied and installed the materials is the "target" and is responsible for it.China makes materials for all countries and cannot keep up with local standards that change frequently. The installer/contractor could become a part of a class action, but would have to go after a distributor or importer, since China does not sell anything in the U.S. and just manufactures to buyers standards. - China is just a country that has huge economy and modern manufacturing capacity, but refuses to export a car depite being one of the 2 largest auto manufacturers in the world, since their demand exceeds the production capacity.
Maybe your plumber can give you help other than an opinion to replace everything, since he may have seen something similar and know the solution other that just doing more work.