Unauthorized deduction

National consumer act must investigate this company. This company deducted R99.99 in July and August from my bank account. I called 0313013805 and I found a lady who told me that refund will show in my account on the 07 Sept. Apparently they are dealing with vouchers and I told her that I never authorized such a thing and I don't even accept anything over the phone, How did this guys get access into my bank account?