Hi guys, I dont know which subreddit exactly I am supposed to post this question to, so if I break the rules or there are a better subreddit to ask this question to, please let me know.

Okay, so I just bought a used 2009 VW polo, engine and everything else is great, the car is very clean. However, there is a noticeable rattling noise coming from the driver door side that comes and go, as well as squeeky noise coming from the rear side of the car (don't know where it's coming from specifically).

I took it to a VW specialist service (not dealers cause they tend to overcharge), however the noises gone when I took it there so they say there is nothing they can do.

Is there a specific shop that would fix this type of problem like a panel beater. Or should I take it back when the noises come back?

Thank you guys