Unapproved debit order

I have been a loyal customer of The box fashion since 2002 and am satisfied with their products and services. However tonight I received a call from their call agent who told me about their organizing boxes for jewellery, scarfs, etc and asked if I would like to upgrade my membership for these products of which I declined because of affordability. She tried to convince me and I refused. I was surprised when I received two SMSes that requested an accept or reject offer from my bank, which I rejected. After a few minutes I received an sms from Capitec Bank (registered mandate) of R672..00, maximum amount of R2010. 00/which I clearly rejected. I have sent an email to The Box fashion for assistance and I'm waiting for their response. I alsp contacted Capitec Bank and received no assistance at all. The agent texted that I have to go to the bank and contact the Box fashion. I feel that my privacy has been compromised because I did not offer that agent any information, shs had all the info on my purchases at The Box Fashion and uaed for debit orders. I really would like to be assisted with this