Standard Bank Vehicle Finance Bad Service

I have paid my installment towards my car on 27 December 2023 using the correct account nr and ref nr provided. I've send several emails with proof of payment and I called Standard Vehicle Finance several times and could only speak to a consultant once and she also ask me to send proof of payment which I did and today I was valled by Standard Vehicle Finance again when I answer they don't speak. Then my account wad handed over for collection even though I did pay my account on time. I'm very disappointed in how they are handling things. Don't don't reply on my emails with proof of payment, when you call you hold on for more then 30 minutes then they still dropp the call