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The meeting is voluntary, so you don't have to say anything, agree to anything or sign anything. In fact, I would recommend that you not sign anything presented to you without having an attorney review it. Hopefully, your contacting the bar assn. will result in locating an attorney to help you out in reviewing any documents presented.
I would recommend that you go and mainly listen to their side of the story/position, tell them that you'll consider their position, that you'll be in touch and leave.
Then take this information to an attorney and try to get some insight into resolving this.