National Automotive Parts Association / NAPA Auto Parts

i've bought a glue from napa auto parts( located at 17650 Monterey Rd, Morgan Hill ) which is one of the staffs who work there recommand to buy to have my problem fixed. It turned out not only did it not work, but also it made my car got scratches. I've talked to the manager, and he 's not going to be responsible for that( I was totally surprised when he said that, what a irresponsible man and store). Please give me a proper response.