Johannesburg - Telecoms group MTN [JSe:MTN] has lodged a complaint with the Uganda judicial service against one of the east African country's chief magistrates, after MTN's senior executives were summoned to face tax fraud charges.MTN accuses the magistrate of unprofessional conduct after MTN Group CEO Sifiso Dabengwa and 12 officials including the chairperson and CEO of MTN Uganda were summoned t