starrysky ~ I'm sorry to hear this but you have to do what is best for you. Acknowledgement, especially when you are volunteering, is huge. It lends the feeling that you aren't being taken advantage of and that you are appreciated. If you weren't being acknowledged - and publicly - they weren't doing their job. They also needed to include you into the team and obviously this was not being done either.

You filled an open position. Consider then that you obviously were not the only one feeling shafted and second guessing themselves.