unban plz - can't join the server

[BL@ck-Arrow]

hi all 
good day 
actully when i try to join the srever Dust2 
i can't , showing me in console 
Server IP address 192.168.5.158:27015
Connecting to 151.80.47.182:27015...
You have been banned from this server 

without any Reason 
hope find solution 

Warm Regard 
thanks