Hi,, you must be new here.
to answer the question: Yes, something can be done. Report them, properly. Also, if they didn't take the truck to a chopshop, it will be back into your garage next restart.
we use THIS section to report players:
http://www.altislife.co.uk/forum/65-report-a-player/
Before reporting a player please read this
Please open a thread with the person you are reporting as the title for example if your reporting Wilco the title would be "Wilco", Then please use the template below, We aim to look into any new reports within 12 hours and reach a decision, The forum is open for reply's however we have a few rules around this.
READ BELOW BEFORE EVEN COMMENTING (Warning points will be issued)
1. The original poster and the person defending themselves may contribute to the post but keep it clean and act like adults.
2. Anyone who does not have any evidence who cannot provide value with evidence there post will be deleted, unless they are of a Admin rank.
3. Anyone who posts edited video to attempt to get the person they are reported in trouble will be banned.
Name of the person you are reporting (in-game name):
Time & Date this happened:
Description of what happened:
Have you tried to resolve with the player before posting?:
Please post video evidence/screenshots here
(This is almost a must! without this you have no solid evidence)