unauthorized debit order from Telcom mobile

Hello Telkom

Telkom has debited my account with an amount of R757.44 without my permission. This is an unauthorized debit order. I don't have any contract with Telkom. This is ***** and I'm very furious because our bank accounts are not protected. Anyone can debit anytime. Telkom I want my money back. The description you have put on the debit order is TELKOMMOBI ********** 170105. Please cancel it, I have lost interest on any of your products since you've debited my account for contract that I don't have.