Absa VF Witholding my Ownership Doc

Absa VF has miscalculated my payments over the term and is now withholding my ownership documents. It looks like someone did not load the last debit order as we agreed. Now they are charging interest on a contractual agreement that closed/ended on the 01st of August 2019. They also accuse me of non payment whilst all the payments are there on record, except their mistake on the last one. Now interest is growing, is that my problem? You decide if you will accept this. Never ever before during the past 15 years have I had these problems with ownership. Luckily, I know which bank will not get my next car loan.