In any instances where an exemption is claimed by reason of the provisions of this part, and the service supplier questions the validity of the claimed exemption, either the service supplier or the service user may request the board to issue a ruling as to the validity of the claimed exemption, accompanying the request with a statement showing the facts and basis for the claim. The board shall issue its ruling within 30 days of receipt of the request. Pending issuance of the ruling, the service supplier shall not be obligated to collect the surcharge from the claimant.