Capitec allow unauthorized bank debit orders

Good Day , There is a debit order that went off my account by the name of 'Bestintern' on my account. The debit order can't be reversed via app. I don't know the company that debited my account, Who gave Capitec permission to accept the debit order. Capitec need to refund the charges to my account or provide me with proof where i signed for this debit order to be deducted on my account