Vodacom online *****

My got a call from vodacom in August 2023 that she bought a cellphone online in April 2023 and has not paid,shocked to hear that she told them she has never bought anything online or from them,they refereed the matter to the ***** departments and then referred her details to MBD Debt Collectors,as we speak MBD calls everyday regarding the said payment,payment on something she has never bought.We were asked to send in documents by emails,namely: an affidavit,copy of id and three signatures for comparison bit to this date that email has,not been responded to but instead we get calls requesting money,we would aoor?we would appreciate some light regarding this.