Installments

Hi my name is Charlton I have a financed vehicle with Mfc Nedbank for 72 month and since I started with them my installment was R3392.09 and and I'm now in my second year and my installment amount went up drastically by 4190.27 and I cannot afford to cope with the amount I had so I had to cancel my insurance to cope with the actual amount I'm dealing with now and they did not let me know in advance that my installment will increase, I need assistance to bring my installment down, I am the breadwinner of my family and 4 Dependants, the interest rate I'm currently on is 8.41% please can you assist to bring it down. Thank you in advance

Kind regards

Charlton