If the solutions plugin isn’t a solution then you could create a set of tags to track the status of the issue. I don’t have a good suggestion for what they are, but maybe something like
- unanswered
- open
- discussed
- satisfied
- unsolvable
And topics would start as unanswered and when there were some responses the user or a moderator could change the tag (you might be able to do something more clever with the automations plugin?). Then you could search for the unanswered ones, for example.