Hacker got me banned?

Hello, so.. few days ago I was casually playing Apex (in Steam) and in the game match I've ran into someone who claims to be a hacker. We had a strong beef because he didn't like how I play, and he told me that quote "I will make you no longer being able to connect to servers".

I thought this was a joke and neglected his threats, but somehow the next morning I actually couldn't connect to game servers! 

Screenshot attached. Some servers are even missing from the list completely and most part of them are unavailable. The one that's working isn't actually working too. 

How do I fix this? 
How this is even possible?? Hackers can just ban you?