Have these other people seen or heard you and presented some form of evidence to this group, perhaps a photograph or a video? A hunch doesn't mean very much.
Those other people have brought letters and written speeches of you to the group in question.
Why? If they are saying unpleasant things about you which are true then it might be wise for you to stay silent and let them think you don't exist.
If such things are not true and you feel motivated to defend your image then you should present yourself and explain your case, how would they know otherwise? If you have no such motivation and do not care what others think of you then again stay silent and allow others to reach whatever conclusions they wish concerning your existence.
Would you defend your image or not?
Do you care what others think of you?