Loans repayment Mess!!!

I have 2 personal loans with FNB (excluding the Revolving Credit). I will call them LOAN1 and LOAN2 1. Personal loans collections has been debiting my LOAN1 account double for the past 3 payments. It has been such a mission to reverse this every time I have to , because my account Is in arrears. Even when I have an arrangement, still no difference. Will it be the story of my life to ask for this refund EVERY MONTH until the arrears are settled ??? 2. The consequences of these monthly deductions are crippling my finances further. This month , my son will have to stay home from school while I wait for FNB to refund me , as is the case now every month. The other month it was my car that was not paid , and interest accrued , while FNB took their sweet time for the reversal. 3. I have a 2nd smaller LOAN2 , and I see now a debit of LOAN1 went there , plus the arrangement of LOAN1 credited there . HOW???