Help with ban information

Issue Type (Required):

Error - Account Authentication Failure

Issue Description (Required):

came back after a few days and was greeted by a ban.
where do i get information about such ban and how to solve it? i got no notifications or emails about the ban.
getting blocked from playing the game i paid for is kinda theft

[PC] Do You Use Mods? (Optional):

No, I don’t use mods

Reproduction Rate (Required):

Constant (100%)

Platform (Required):

Steam (PC)

Player ID (Optional):

Please see your DMs.