******* debit order

I have been a member of Virgin Active for over two years and all debit orders have come from my primary account that I use, however on 31.01 V.A took a debit order against my other bank account , which I never gave them details to. This was extremely suspicious as the amount (R114) was not even the normal subscription cost. I emailed the service address but no one has contacted me, I am extremely mad that someone at V.A has my bank details that I never gave them and is taking debit orders without my consent. I called V.A and they confirmed that some other member had been linked to my account , I sent them proof of my bank details but still they dont refund me. This is *******!