What do you hope to regain by pursuing it further? Do you think you have a reasonable chance of getting it fixed or getting monetarily recompensed?
If you don’t think that is likely (it seems pretty unlikely to me from your story), then what DO you hope to gain? sweet revenge? aggravation? an ulcer, C’V?
I’m not saying whether or not you are “right” in pursuing it, but asking what do YOU think is the best thing for you and your family? Being right is not always a good reason to pursue a nasty machlokes.