Dissatisfied with ABSA Private banking and AVAF

I have been trying to get hold of my private banker for the passed week but I am obtaining no response from the private banker (Gugulethu Mthembu) as well as the transactional banker (Bomkazi Siboyana) with the regards to the following: ABSA is alleging that I am in arrears with my car instalment since May but no evidence exists of such on any of my statements. They have then added it to my aged analysis for August after zero communication with me regarding this. Apparently it shows on their system that the partly amount was sent back. How is this possible when it does not even reflect on my cheque account statement nor on my aged analysis of my AVAF statement for June & July. The consultants who call me to tell me the above are extremely rude. I am very close to moving my account to another bank because honestly I cannot deal with this, this is the worst service ever received. Emailed transactional banker on Monday, it is end of business on Wednesday already.