i want to get unbanned from global blacklist

if you have a residential (home) connection, you need to change the dynamic ip assigned to your modem (by doing a DHCP release). easiest way is to try to turn off your modem for 10 minutes and then turn it on again to see if your ip has changed, works especially well if you have DSL. the best way is to make your modem release the ip in the modem settings.

also change your name to something different for safety measure.

hi ppl, sorry if this does not belong here, but if I use a hack on the 0.75 version, and get banned. will i get banned from my payed steam version?

No. They are completely different and have different ban lists. In fact, I am not even sure if you can get banned in the steam version as of yet.