Why on earth did you go to a meeting?! What were you thinking? Had you thought it through, you would have realized that it would all start over again.
When they persist in asking why you are helping with Grandma, tell them it is the Christian thing to do. Quote a scripture or two.
While you wait to be moved someplace else, are the two of you looking for friends? Have you joined any groups that you're interested in, done some community volunteer work, maybe join a group that walks or runs together? Please find friends elsewhere that aren't conditional so you will not be tempted to go back. Maybe soon you will be willing to look at some local churches that are active in the community?
But stay away from the hall, and please ignore their calls/texts. It's the best way to stop them.