hey there , have you read the topic : [PLEASE READ] Official servers - Terms of conduct, guidelines and procedures
?
in there (if you read it from top to bottom) is explained how to apeal a ban ! if you feel like it was a mistake !
also valve is not the owner of the game just a distributor and will have no effects on your situation, furthermore if you played 2000+ hours , as steam policy is after you played 1h of any games , no refund and they will tell you to contact the game company !