Hacked - where to report this?

[Wufje]

Hi,
This afternoon the following happened:
-my playlists were deleted and replaced by playlists with french artists.
-i got "press this link to reset your password"-mail by Spotify with in the URL reference to FR instead of NL where I am from.
-an iPhone appeared in my offline machines with the date of today.

This gives me reason to believe I was somehow hacked. Nothing different happened in the last few days worth mentioning. Daily use with no problems.

My question:
Where to report this and is there any chance to get my playlists back?

Thanks in advance!
Attached: proof of the iPhone and playlists appearing.

Edit: of course I changed my password and logged off all devices.