Priority Auto and Tire Center

2007 minivan with check engine light.they did the diagnosis. fault code p0450 and they said gas cap.paid for diagnosis and parts.2 days and check engine light back on, went back and guess what same code.instead of stepping up and fix the car because they misdiagnosed it they charged again for another part they said it is the cause.2 days goes by and check engine light back on p0450 again.i called and asked them are you guys actually doing diagnosis or just guessing and putting different parts ? Are u going to fix it for free now?the guy got angry and said
We do not guess and do you know how many different parts can cause this light?
My answer is yes i know and here is the list
Leaking fuel pump.purge valve stuck open.gas cap.close canister valve.cracked charcol canister.evap hoses.pcm fault and i also know that for this code you need to put the car in evap test mode and use smoke test machine to determine the fault not guessing and putting different parts everytime. If i dont get this resolved the right way review will be posted on all social media and i will file a complaint with BBB southern arizona.if problem gets resolved this review will be deleted and no complaint will be filed