You get what you pay for. WTF did you think you were gettting with a $300 complete upper? Good parts cost good money. You got EXACTLY what you deserved. Shouldve ponied up more money for a quality upper rather than bitch your PTAC bottom basement price upper was bottom basement junk quality. Who'dve thought....
My personal opinion.... I wish PSA would do away with PTAC all together. Its ruining your brand.
ETA: you bought a "no frills" product and received exactly that. You gambled and lost. PSA owes you nothing. You got what you paid for. Be happy.