Problems with Gold Version on Steam

[osn]

I wasn't around for a while but my "XIII Century – Gold Edition" is gone...

Last year I bought "XIII Century – Gold Edition" on Steam. I never had much problems.
Except I wasn't able to start the game from the Steam program. I just did it manually. Also my gameplay houres etc were never saved on the Steam program.

Some time ago I formatted my pc and reinstalled steam.
"XIII Century – Gold Edition" was just... gone without any traces. It's like I never even bought it!

I just wrote this on the steam helpdesk, but you guys might wanted to know why I was away. Until now I also can't find my payment proof so I guess I'm in trouble.