So she’s not talking to you anymore. I’d suggest you try to take advantage of that situation. Look at the bright side. I think what you need to do now is to show that their behaviour is not affecting you. As for the comments made, a nice answer to that would have been to talk to them normally, showing that you don’t see any connection with the comment and anyone you know. Add in a nice grin to make things more effective. Then at a later point, talk about that someone you know whose guests refuse to leave. Or you could also start talking about how much you enjoyed your dawat and thanking the people for coming over and stuff, saying you need to do it again, and how you thought that was one of your best dawats in a long time. You’ve got to show that you’re not going to be intimidated by them. Try to avoid arguing with the husband. This is probably a tense situation for him too.
What’s the situation with going out, getting mail and regular errands now? I’d say you take the opportunity to take little steps and reestablish the boundaries.