I have a f150 2017 and recently my engine blew at 100k miles (5.0). When they replaced it I got it back with a caved in grille. I am pretty sure it was already like this, and the mechanic accidentally "aggravated" the problem making it visually apparent. Prior to going into the shop the LEFT side of the grille was caved in and not fitting properly, while the right side was flush with the light. Now it's the opposite and substantially worse looking.

What do you reckon I ought to do? I can get more images if needed, I just don't know where to start my thought processes. Never dealt with this before.

 

I’d say it most likely broken and you need a new grille or try and repair that one. If your lucky it just never got reattached.

 

Q: I took my truck in for service and got it back with an obvious problem. What should I do?
A: Take it back to the shop and make them fix it. Don't drive away from a shop with an obvious problem they caused because after you leave they're probably (and understandably) going to resist taking responsibility for it.