Irate client- ABSA Vehicle Finance

So frustrated with ABSA motor vehicle finance. I have been in daily correspondence war with absa. They harass me daily for payments alleging my account is in arrears due to feb and march payment not received. I have spoked to numerous consultants i have emailed all my proof of payments, bank statements, proof from my banker, sms and email from my bank that the debit order did run. Now im being listed as slow payer, being charged for arrear interest and harassed daily by consultants. The more i exPlain payment was done I actually paid r2000 extra the the more they refuse to assist. This has been going on since June 2019