False account with Vodacom reflect negative personal credit record

Someone committed ID theft and opened an account with Vodacom (and other stores) with my wife's identity. As soon we realized this, my wife got and affidavit and other required documents and sent it to Vodacom as well as their Debt Collecting agency, Nimble Group.

We received no feedback from either company as to the clearing of my wife's name on this account and the default with Vodacom still reflects on my wife's credit record which makes it impossible for her to get housing, car or other finance.

Can someone from Vodacom or Nimble Group please assist us in this matter?!