(despite you trying to smooth things over?) then I don't know what you can do.

If it was just a misunderstanding, then you ought to be able to put that straight in an e-mail, or PM or text message?

If they still don't respond, then I guess it's a waiting game until the heat goes out of the situation or until next time you bump into them socially.

Not much help, really, am I :(

Hope you get it sorted out and everything turns out OK.