The first respondent (EW (Pvt) Ltd) appealed against a decision by the Zimbabwe Revenue Authority (second respondent) imposing retrospective duty of US$15,884,943.46 and a 300% penalty of US$47,654,830.38 for importation of base station components between 2009 and June 2013. To support its appeal, the first respondent sought to call evidence from the first applicant's managing director (second applicant) to show that the first applicant had imported similar base station components under a duty-free tariff regime, thereby demonstrating discriminatory treatment. The first respondent obtained an order for a subpoena duces tecum compelling the second applicant to testify and produce bills of entry, packing lists, invoices and proof of payment of duty on base stations imported by the first applicant from October 1998 to November 2013. The applicants sought to set aside the subpoena on grounds that it was invasive, incompetent in scope, irrelevant, violated their right to privacy, and was unduly oppressive.