Techzone debit into my account for unknown service.

i was approached by Techzone to take a data contract on behalf of Telkom SA, the agreement was for me to pay R139.00 every month to Telkom but since the begining of my contract in October 2018, Techzone has been debiting R139.00 from my account and also Telkom has been debiting the same amount from my account.

i have made enquiry with Telkom in this regard and they have confirmed that Techzone has no right to debit my account and thus far i am struggling to get hold of Techzone in order to request a refund.

please assist in this regard.