Ugh, how does this happen?!

Warning: this is mostly a rant of my latest Mustang servicing.

My '07 GT has had a rattling noise coming from under the car at a certain RPM when it's cold. It would go away whenever it warmed up so I wasn't too worried and lived with it until it was time for an oil change. I bring it in to the local Ford service department to leave it over night with them so they can start it in the morning and diagnose the rattling and fix it along with do an oil change.

I pick it up today around lunch time and they said they fixed the rattle and I'm all set. On the drive home I notice a noise I haven't heard before. After a few minutes I figure out it's the drivers side window rattling against something inside the door (I had the windows down). So now every time I go over a bump or close the door with the window down it rattles annoyingly. How do they go and fix one noise then produce another one? I had never heard the window rattle like this before I brought it in.

I called them back up and scheduled to bring it in on Monday and have them fix this while I wait. I'm going to make sure I don't hear any new noises before I leave

I think I may have figured out what caused the window to start rattling. I noticed a fairly sizable paint scratch on the door handle on my drivers side. It appears that some tech or someone working on my car slammed my door into something causing something in the door to come loose or break and rattle whenever I drive. When I go back for my appointment tomorrow I'm going to point it out and say that it must have been them and demand they fix my window and reimburse me for the cost to get the door handle repainted.