FNB Ruins Christmas and New Year for my Family

I have a personal loan at FNB. My Loan is UP TO DATE. On 14 Dec 2020 they Deducted an EARLY Payment to which I had no Choice. I asked for it to be revered. It was NOT DONE. FNB RUINED MY CHRISTMAS. On 2 Jan 2021 The Deducted the loan installment AGAIN. So a DOUBLE Installment was taken for 1 Jan 2021. How is a Normal person supposed to survive this. DO NOT BANK WITH FNB. THEY WILL RUIN YOUR LIFE!!!!!!!!!!!!!