ABSA Vehicle Finance refusing to assist with a payment arrangement

I contacted ABSA vehicle finance collections department on the 09th of January 2021 and i spoke to the guy by the name John, i was trying to make an arrangement knowing that i am 1 instalment behind, i said to him i will be able to make an additional payment of R900 on top of my normal instalment to make up for the arrears amount and he told me that they do not listen to what the client is saying, they are supposed to tell the client what the client must pay to settle the arrears amount. according to the National Credit Regulator, credit providers can assist consumers to re-arrange their repayment to affordable levels however according to John from ABSA Vehicle Finance collections department, i have to pay what he thinks i can afford, i am now sitting in a situation where by i can't make an arrangement because i don't want to promise to pay the amount which i know very well i cannot afford and end up defaulting on the arrangement, can someone from ABSA's complaints department please assist. Abraham.