Unauthorised debit order

I have been with telkom for almost 2 years now so on the last day of June 2018 I went to their branch in carnival mall for the 10 G special soon after that there was a debit order of R99 referenced RNR went to my bank to enquire about it and they say its from South African Payment Exchange and they gave me their contact details and when I called that company they reffered me to a company called Empangeni IT trading as Fluid marketing and when I tried contacting them the phone rings with no answer so I googled the company and this is their email address ********** so basically they are linked to telkom some how telkom is making unauthorised debit orders from my account on top of the agreed amount that they are debiting from my account.