Contract Application Declined

I app**** for a contract this morning online. It was refused and when I called to enquire why, the call center agent gave me a very vague reason of \Duplicate Banking details used"and that I should call Transunion. I spoke to the transunion agent and he says he can not see any reason why it should have been refused and that he does not know what \""Duplicate banking details used\"" means as a reason for refusal. Can someone from Vodacom please give me a proper reason why my contract application was refused???"""