Invalid Steam ID 76561198048601492 IGN:!BawmBenjoin! (SR Scammer)

I didnt know that i was a marked as a scammer until one of my friends told me and when i tried to go onto a trade server and it notified me that i was a scammer and i didnt know why . I think that my account got hacked by somebody who i dont know as i never ever shared my account details and shockingly it still got hacked and its very saddening for me to not be able to trade cause of someone else's greediness that caused this and i feel that its very unfair and I hope i can get unmarked . Thanks For Your Time.

You have to appeal your TF2OP tag first.
http://forums.steamrep.com/threads/howto-appeal-scammer-and-caution-reputation-tags.58/