Standard bank vehicle finance a nightmare

My troubles came early January 2024 when I got my vehicle finance statement. I realized that they did not debit for December 2023 and I called them to either debit or I can EFT. They told me that my account was in order but mentioned that I did 6k payment in December and 3k in January hence they did not debit. I told them that I did not make those payments and no one could give me answers or way forward to sort out December payment that was not debited. I then payed 7k in January 11 2024 and gave the instruction to lower term and keep monthly debit the same. Since I was told they will investigate where other payments came from I never gotten feedback and desired to link my account with my app and that's where I noticed lots of activities. They reversed all payments including one I made but I do not know where are they reversed to. Then I get a call telling me that i am 12k behind when I ask how they check account and can't tell where 12k arrears come from and told me he will escalate it to other team and will get back. Following day I called after not getting feedback and the person says I am 8k behind and still could not tell me where the 8k come from and gave me supervisor email. Supervisor referred me to someone elso who could not help and told me he will escalate the issue and will give me feedback Friday 2 Feb 2024. I got a call Friday from someone else instead of feedback I am to I am 120 days behind and I snapped and dropped the call. I must say this is abuse/harassment of highest level as I have tried everything even visiting branch and asked for face to face meetings but no luck and no willingness. I am actually doing the banking myself and if I do not I will pay for ever. I am now looking on involving lawyers.