Bad customer service

Terrible customer service, fnb debited my account twice in December, then after charged me for an unpaid debit order. Did the same thing now January told me I dont have enough funds in my bank account. My debit order day is the 1st, they took my money on the 28th of December, again on the 3rd of January 2022. Same day on the 3rd of January they say I don't have funds and charge me yet again. 3rd February they deduct twice, when I'm on the phone with them they tell me I had insufficient funds in January so they had to debit twice . Terrible, Terrible!!!!!!!!