Unhappy customer with unauthorised debit orders

My mom is a senior citizen in SA, her account is always debited with unauthorized debit orders monthly which equates to R200 or more. She stays in GaSekororo which is 45 km to Tzaneen since Maake Plaza is closed during Covid 19 she is unable to get to FNB Tzaneen without a permit. I loaded airtime so that she can contact the contact centre for help ***, but the call centre agent requested a pin code which is shocking. Lucky I told her not to give anyone her personalized pin code. Now she is sitting home with a need for her R200 to be reversed and she has nowhere to run to. FNB please reverse my mom's unauthorized debit order. Contact her on ***, if there is no network coverage call my sister who stays with her on ***. This is a monthly exercise that she is expected to do but Covid 19 is making it difficult but R200 to her means the world.

Can someone please reverse the unauthorized debits and contact my mom since I do not have signing authority on her account.