Forewarning

If they continue with a repetitive line of questioning, give them a forewarning of their mistake, and notify them of the consequences.
For example: They may try and label you, either as “resident” or “taxpayer” or “proprietor”.
Or they may be still trying to apply a mandate or notice upon you, which would be unlawful and illegal.
At this point you can now begin to make statements, as long as you follow up with a question.
For example: “I must ask you to cease and desist in calling me ‘taxpayer’ as you have no evidence to apply that title to me. Do you understand?”
Or another example: “Are you trying to mandate me? I must give you forewarning that you are committing a crime against me, and I shall be pressing charges. Do you understand?”
Note: At this stage, it is a safe move to make statements to points that have already been established within the conversation, and are already on the record.