Absa Vehicle finance is terrible

I currently have a vehicle finance with Absa bank, since 2017. From 2019 I started adding extra monthly payments towards my debt of R300 every month till 2021. Later on I was told that those payments haven’t been traced because I was supposed to add my account number as a reference, thereafter was requested to send them proof of payments so that they can link those payments to my account. I then did that, however never got any feedback, I tried to call them and never got any assistance. The payments did go to the Absa account, the issue was with linking those payments to me. I do have proof of payments till to date. I never got assistance from Absa vehicle finance with this issue, and the aim for making these payments was to reduce the time period for paying for my debt. It’s frustrating.