Wi-Fi on medion laptop does not work?

I recently got my laptop back from medion when it was damaged by water and they had to repair it. But now the Wi-Fi no longer works, means:

it is connected, but i have no internet

this symbol comes with the "world" and the x

what can I do?

Does the DSL also work?

If other devices have internet access, then look in the router menu to see if the laptop is locked there.