The woman to whom.the complaint was made (who was 'overseeing' proceedings) did not, according to Nonnie, go inside after hearing her complaint (which means she was outside)
One would hope that the woman took the name and address of the complainant and perhaps other contact details so that a proper investigation could be launched. That would indeed be taking it seriously.
I would, had it been me, have expected the woman to return inside immediately and either have the person removed or had a stern word before he handed out any more voting slips.
Was the polling clerk's influence verbal or by his indication of a place on the voting slip?
Mine was handed to me already folded in half.