Insults on Instagram in private conversations – reason enough for the police to take care of it or is it exaggerated?

One person is from London, the other from Vienna. Insults were exchanged in private messages (Zionist pig, Nazi, you would vote for AH if he were alive,…) – could anything be done about this, legally? Or is this something the police aren't willing or able to use their resources on, especially since they're in two…

What kind of number is that? How do I find out who it is?

For the past two months I've been constantly receiving text messages from a number that isn't in my contact list, and it's really annoying. It's anonymous and I can never reply to the message. The person just keeps insulting me, and the worst part is, they always write things that match my profile picture, so…