unprofessional and immoral consultant

My Mother who is unemployed received a call from a Matthew Naidoo from Mobile Plus on the 13th of Jan 2015.The gentleman was selling her a service which enables her to get airtime every month which will be deducted from her debit card monthly.The gentleman seemed to have all my Mother's details including her banking details.He asked her to confirm the details and thereafter explaining to him not to activate anything as she's unemployed and cannot afford such a service.From the 17th of Feb she's been receiving free airtime which she could not understand the origin of or sender.This morning she received an SMS from the company which had a contact number.Upon contact we were told that she has to pay R800 to cancel the subscription which she did not even consent to.This Matthew guy needs to sort this mess out as as soon as possible before further steps are taken.My Mother is aggrieved by the whole incident as she does not even understand how a stranger even has her banking details and has the audacity to do things without her permission.She feels that her privacy as a consumer has been violated and needs the matter to be investigated and sorted out.What kind of a sick company are you?