unauthorised billling of data and airtime

good day

my mum has been billed since June 2015 for data and airtime without her knowledge and Authorisation. she discovered this issue last week when she contacted Edgars regarding her installments. after all the payments she does not even receive any data or airtime as i have her on a vodacom contract. i would like to know how can this provider do such a thing without her consent!!! how many other citizens are making payments to this provider without their consent?? i need a full reimbur*****t of all the months she have been paying for something that she has not been receiving ???

however this needs to be resolved as soon as possible. i can be contacted on ********** 103