Loan balance going up, Installment going up monthly, Please explain to me.

I lost my Job in Nov 2017, I went to Capitec Braamfontein, to make an arrangement, and i changed the debit date to the last day of the month,Arrangement was made, for 3months, and I was advised that after 3months I must go back to the back, to make another arrangement, I went to Capitec Fourways Mall, I told them to cancel the arrangement, as I was told that I was on arrears for making the arrangement of which I was never informed in Braamfontein. I told them that I will start to pay the original installment on the last day of the month/ 2nd of every month.

However Capitec has been attempting to debit money on my account every month on the dates which we never agreed on. Each and every failed debit order costs me R150 each, I have to pay more than R1000. 00 bank charges which is ridiculous. On the 30th Of April R8, 863.60 was debited from my account, of which R3861 was for the arrears accumulated from the arrangement, and I was told that rest of the amount is April installment, I went to the bank in Germiston, I spoke to Siya on the 30th of April, she said they were going to reverse the money in an hour, which never happened.I went to the back on the 2nd of May,I spoke to Tsumbi (Bank Manager) she told me that I payed the May installment, and that my account was still in arrears. How do I pay 2months installments in 2 days??? she said the system is automated. I went to my bank and reversed everything.

Now Capitec explain to me: How much is my monthly installment? When is my debit date? I want my account to be up to date, but you cannot come and debit any amount, whenever you feel like it.